6.NOS.3 Lesson 2-11-part2 Apply Day · Practice
MASTERY CHECK
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2.11 · Part II

Application Practice for Today's Problem

Add and Subtract Decimals · Decimal

Interactive Workbench & Models →
Name: Date: Period: Learning Goal:
■ CONCEPT SUMMARY & GUIDED NOTES: 2.11 · Part II
1Adding & Subtracting Decimals
2Strategy Model — step by step
  1. Line up the decimal points vertically by place value
  2. Insert placeholder zeros so each number has the same number of decimal digits
  3. Add or subtract right-to-left, regrouping as needed, and drop decimal straight down
3Mathematical Word Bank
  • Add and Subtract Decimals (Sumar y restar decimales) — Combine or find the difference between decimals by lining up equal place values.
  • Decimal (Decimal) — A number with a dot, like 0.5, that shows a part less than one.
  • Place value (Valor posicional) — What a digit is worth based on where it sits in a number.
  • Tenths (Décimas) — The first spot after the decimal point. It shows parts out of 10.
  • Hundredths (Centésimas) — The second spot after the decimal point. It shows parts out of 100.
  • Annex zeros (Agregar ceros) — Adding zeros at the end of a decimal so numbers line up evenly.
4Watch out
  • A common mistake in Add and Subtract Decimals is lining up the last digits (the right edges) of each number instead of lining up the decimal points — for example, adding 8.3 and 2.45 as if the 3 and the 5 belong in the same column. Before you add or subtract, add zeros so every number has the same number of decimal places (write 8.3 as 8.30), then check that the decimal points sit directly above one another.
  1. 1 MULTIPLE CHOICE

    What is 50 − 23.47?

    1. A26.53
    2. B27.53
    3. C26.63
    4. D27.47
    Line up the place values
    1. 1Line upPoints under points.
    2. 2Fill gapsWrite in the zeros.
    3. 3OperateRight to left.
    4. 4Bring the point downStraight down.
  2. 2 MULTIPLE CHOICE

    A student buys items costing $4.59, $12.75, and $3.80. What is the total cost?

    1. A$21.14
    2. B$20.14
    3. C$21.04
    4. D$21.24
    ✏️ Workspace & Solution Steps
  3. 3 MULTIPLE CHOICE

    Case File: A crew member's snack receipt shows $27.60 for dried fruit and $15.45 for protein bars. What is the total on the receipt?

    1. A$43.05
    2. B$42.05
    3. C$43.15
    4. D$42.95
    ✏️ Workspace & Solution Steps
  4. 4 MULTIPLE CHOICE

    Case File: The oxygen gauge dropped from 9.6 units to a new reading after the crew used 4.75 units. How much oxygen is left?

    1. A4.85
    2. B5.85
    3. C4.95
    4. D5.15
    ✏️ Workspace & Solution Steps
  5. 5 MULTIPLE CHOICE

    Case File: A supply log started the shift with $48.00 in the station snack fund. By the end, $31.27 had been spent. How much is left in the fund?

    1. A$16.73
    2. B$17.73
    3. C$16.83
    4. D$17.27
    ✏️ Workspace & Solution Steps
📐 CER MATHEMATICAL PROOF MATRIX (CER 2.0) SMP.3 / Proof & Justification

Writing Task: Justify why your mathematical solution is accurate and complete.

C Claim
Starter: My mathematical claim is that the solution is...
E Evidence
Starter: The evidence from the model/table demonstrates that...
R Reasoning
Starter: This proves my answer because the standard mathematical definition of...
Student Mastery Self-Assessment:
1 · Need More Support
2 · Getting Closer
3 · Got It / Solid
4 · Master / Can Teach It