📈 Math Intervention

← All intervention topics

📊 Builds 6.AT.A.3c

Percents & Proportions

Convert fractions, decimals, and percents and solve real percent problems — discounts, tax, and tips.

Learning objective

I can find the percent of a number, change between fractions, decimals, and percents, find the whole, and solve discount, tax, and tip problems.

🎯 Builds 6.AT.A.3c 📚 4 lessons ⏱ 30 min

Core question

How can I model, solve, and explain percents & Proportions so another student understands my thinking?

Concept spine

Understand the situation, represent it, choose the strategy, then prove the answer.

Evidence of mastery

Score 80% or higher, correct one missed item in Smart Review, and write a complete explanation using at least one vocabulary word.

Key vocabulary

  • Percent — A part out of 100; the symbol is %.
  • Percent of a number — Multiplying a percent by a number to find a part.
  • Discount — An amount taken off the regular price.
  • Sales tax — Extra money added to a price, set by the government.
  • Tip — Extra money you give for good service.
  • The whole — The total amount that a part comes from.

Materials

  • Calculator
  • Pencil and scratch paper
  • Hundredths grid (10 by 10) printout
  • Percent-fraction-decimal anchor chart
Mission

Rebuild percents & Proportions

Move from model to strategy to independent proof using % of a number, conversions, find the whole, and discounts.

Success looks like

Show, solve, explain

Students can represent the idea, solve accurately, and justify why the answer makes sense.

Teacher evidence

6.AT.A.3c

Look for accurate use of % of a number, conversions, find the whole, and discounts and a clear explanation.

Larger concept

Before students chase speed, they build the whole idea. Use this as the opening map for a small group, tutoring block, or independent recovery path.

Concept spine

The big idea: Percents & Proportions is about choosing a representation, keeping quantities organized, and defending the strategy.

Understand

Name the quantities

Students identify what is known, what is unknown, and which vocabulary from percents & Proportions matters.

Represent

Build the model

Represent percents & Proportions with a visual model, a table, and an equation.

Strategize

Choose the tool

Students connect the model to % of a number, conversions, find the whole, and discounts and explain why that tool fits.

Prove

Justify and revise

Students use the discourse frame, check for the likely misconception, and revise the written explanation.

Teacher frame

Open with the larger concept before students touch the practice set: What does the situation mean, what model fits it, and how will we know the answer is reasonable?

Essential question

How do mathematicians use % of a number, conversions, find the whole, and discounts to make sense of real problems and defend an answer?

Launch

Make the gap visible

Students preview % of a number, conversions, find the whole, and discounts with one low-floor problem, one model, and one vocabulary check.

Model

Connect concrete to symbolic

Represent percents & Proportions with a visual model, a table, and an equation.

Explain

Require math talk

Students complete the frame: "My strategy works because ___."

Transfer

Apply in context

Ask students to create a new problem that uses the same structure.

Model it

Represent percents & Proportions with a visual model, a table, and an equation.

Say it

My strategy works because ___.

Extend it

Ask students to create a new problem that uses the same structure.

Mini-lessons inside the larger topic

Teach the big idea first, then open one mini-lesson at a time. Each mini-lesson has a narrow objective, one teacher move, one model, practice, an error to catch, and evidence to collect.

Lesson 1
Open the concept

% of a number

I can explain what % of a number means before I calculate.

Teacher move
Launch with a low-floor context and ask students to show % of a number with a model before naming a rule.
Model or example
Find 20% of 45. Work it aloud, then cover the steps and ask students to rebuild the reasoning.
Student practice
What is 10% of 80? | What is 50% of 48? | Write 3/4 as a percent.
Error to catch
Students may answer procedurally without explaining why the method works for percents & Proportions.
Evidence
Annotated model and one accurate independent item.
Lesson 2
Build the next piece

Conversions

I can use conversions as one part of solving percents & Proportions problems.

Teacher move
Use the previous mini-lesson as the anchor, then add conversions with one worked example and one parallel try-it item.
Model or example
A $50 game is 20% off. What is the sale price? Work it aloud, then cover the steps and ask students to rebuild the reasoning.
Student practice
Write 0.35 as a percent. | Write 45% as a decimal. | What is 25% of 60?
Error to catch
Students may treat conversions as a shortcut instead of connecting it back to the model.
Evidence
Annotated model and one accurate independent item.
Lesson 3
Build the next piece

Find the whole

I can use find the whole as one part of solving percents & Proportions problems.

Teacher move
Use the previous mini-lesson as the anchor, then add find the whole with one worked example and one parallel try-it item.
Model or example
A $40 dinner has a 15% tip and 6% tax added. What is the total cost? Work it aloud, then cover the steps and ask students to rebuild the reasoning.
Student practice
Write 1/5 as a percent. | What is 20% of 45? | Write 0.6 as a percent.
Error to catch
Students may treat find the whole as a shortcut instead of connecting it back to the model.
Evidence
Annotated model and one accurate independent item.
Lesson 4
Connect and transfer

Discounts

I can use discounts as one part of solving percents & Proportions problems.

Teacher move
Use the previous mini-lesson as the anchor, then add discounts with one worked example and one parallel try-it item.
Model or example
Find 20% of 45. Work it aloud, then cover the steps and ask students to rebuild the reasoning.
Student practice
What is 15% of 200? | What is 75% of 40? | Write 5/8 as a percent.
Error to catch
Students may treat discounts as a shortcut instead of connecting it back to the model.
Evidence
Exit ticket plus revised explanation.

How the pieces connect

Students should not experience these as separate activities. Each mini-lesson adds one piece to the same concept spine: understand, represent, strategize, and prove.

Five-session lesson path

This is the teacher-ready pacing model for intervention blocks, tutoring, pull-out groups, or independent catch-up work.

Session 1

Diagnose and name the gap

Teacher move
Assign the pre-quiz, sort students into groups, and launch one low-floor model.
Student work
Take the pre-quiz, complete the diagnostic, and write one goal for the topic.
Evidence
Pre-quiz score, diagnostic score, student goal.
Session 2

Build the concept

Teacher move
Represent percents & Proportions with a visual model, a table, and an equation.
Student work
Annotate the worked examples and complete the concept lab discussion frame.
Evidence
Annotated example, vocabulary sentence, model check.
Session 3

Practice with feedback

Teacher move
Conference with students using Smart Review misses and the Error Clinic protocol.
Student work
Complete Practice, Smart Review, and the fluency drill until one score improves.
Evidence
Practice percent, cleared Smart Review item, fluency count.
Session 4

Apply and transfer

Teacher move
Assign Worksheet B and the performance task; listen for the discourse frame.
Student work
Solve a contextual problem, explain the strategy, and revise the explanation.
Evidence
Performance task, revised explanation, exit ticket.
Session 5

Reassess and reflect

Teacher move
Assign the post-quiz, compare growth, and select the next intervention move.
Student work
Take the post-quiz and complete a reflection on what changed.
Evidence
Post-quiz score, reflection, next-step recommendation.

Placement pathways

Use the pre-quiz and diagnostic score to select the right route without lowering the grade-level expectation.

Pre-quiz or diagnostic below 50%

Intensive reteach

Teacher-led model, manipulatives, read-aloud question support, Worksheet A odd items, then one Smart Review item.

50% to 79% or inconsistent explanations

Guided practice

Concept Lab, worked examples, Practice, Error Clinic, Worksheet A/B mix, and an exit ticket conference.

80%+ with clear explanation

Extension and transfer

Worksheet B challenge, performance task, student-created example, and peer teaching using the discourse frame.

Worked examples

Study these three examples — easy to challenge — then head to Practice.

Example 1Warm-up

Find 20% of 45.

  1. Change the percent to a decimal: 20% = 0.20.
  2. Multiply the decimal by the number: 0.20 times 45.
  3. 0.20 times 45 equals 9.
Answer: 9
Example 2On level

A $50 game is 20% off. What is the sale price?

  1. Find the discount: 20% of 50 = 0.20 times 50 = $10.
  2. Subtract the discount from the regular price: 50 minus 10.
  3. The sale price is $40.
Answer: $40
Example 3Challenge

A $40 dinner has a 15% tip and 6% tax added. What is the total cost?

  1. Find the tip: 15% of 40 = 0.15 times 40 = $6.
  2. Find the tax: 6% of 40 = 0.06 times 40 = $2.40.
  3. Add everything together: 40 + 6 + 2.40 = $48.40.
Answer: $48.40

Where do you start?

Six quick questions. We'll tell you whether to skip ahead or dig in.

Practice with instant feedback

Ten questions, self-checking. Aim for 80%+, then try the game.

Answer Drop

Tap a falling tile — or press number keys 1–4 — to match the problem. Five lives — how high can you climb?

Answer Drop

Click the tile that solves the problem — or use number keys 1–4 — before it hits the bottom.

Error clinic

Use this as a quick conference script after a missed diagnostic, a worksheet error, or a low post-quiz score.

Likely misconception

Students may answer procedurally without explaining why the method works for percents & Proportions.

Teacher move

Look for accurate use of % of a number, conversions, find the whole, and discounts and a clear explanation.

Student self-check

Can I show the problem with a model, name the operation or relationship, and explain why my answer is reasonable?

Two-minute conference

  1. Ask the student to point to the exact step where the answer changed.
  2. Have the student restate the problem using one vocabulary word from this topic.
  3. Rebuild one simpler example together, then ask the student to solve a parallel problem alone.

Performance task

Students apply percents & Proportions in a short constructed-response task. This gives publishers, teachers, and families evidence beyond multiple choice.

Scenario

Percents & Proportions in the real world

Create a realistic situation where someone must use % of a number, conversions, find the whole, and discounts. Solve it two ways: first with a model or diagram, then with numbers or symbols. Finish by explaining why the answer is reasonable.

Student deliverables

  • A labeled model, diagram, table, or number line.
  • A complete solution with units or labels.
  • A written explanation using at least one vocabulary word.
  • A revised answer after checking for the common misconception.

Notebook prompts

  1. Before I solve, the quantities I notice are ___ and ___.
  2. A model that helps me understand percents & Proportions is ___ because ___.
  3. One mistake a student might make is ___; I would fix it by ___.
  4. My post-quiz goal is ___, and the evidence I will use is ___.
4 · Publishes math thinking Accurate answer, efficient strategy, clear model, complete explanation, and correct vocabulary.
3 · Meets standard Accurate answer and a mostly clear strategy with enough explanation to follow the thinking.
2 · Developing Partially correct work; model or explanation shows a gap that can be repaired with feedback.
1 · Needs reteach Misconception is still present; student needs a concrete model and a smaller parallel problem.

60-second fluency drill

Answer as many as you can before the clock runs out — speed plus accuracy builds automaticity.

Vocabulary flashcards

Tap a card to flip it. Use 🔊 to hear the word and meaning.

Percent
A part out of 100; the symbol is %.
Percent of a number
Multiplying a percent by a number to find a part.
Discount
An amount taken off the regular price.
Sales tax
Extra money added to a price, set by the government.
Tip
Extra money you give for good service.
The whole
The total amount that a part comes from.

Pre-Quiz & Post-Quiz

Assign the pre-quiz before the station and the post-quiz after. Each comes in a student version and a teacher (auto-graded) version.

Quiz links are wired from assets/forms-links.js once the Google Forms are generated (see scripts/intervention/forms.gs).

Track your learning

Check each box when you can do it on your own.

Differentiation

Level 1 — Support

Level 1 (support): use the Materials manipulatives, study the worked examples, and work one step at a time.

Level 2 — Stretch

Level 2 (stretch): finish the ★ challenge on Worksheet B and explain your reasoning in words.

Success criteria

  • I can represent the math with a model, table, number line, diagram, or equation.
  • I can use % of a number, conversions, find the whole, and discounts accurately and explain why the strategy fits the problem.
  • I can find and correct an error by naming the misconception.
  • I can prove growth with a post-quiz score, an exit ticket, and a written explanation.

Language supports

Preteach the key vocabulary, then ask students to use it in a complete sentence.

Talk frame: My strategy works because ___.

Talk-Write-Revise: say the strategy with a partner, write one complete explanation, then revise it with a vocabulary word.