Lesson 1.1Math is Mine
Start hereWords, worked example, and sentence starters
Learning target I can describe the ways we are all doers of math, and compare my math story with a classmate's.
Start hereWords for this lesson
Read each word before you begin. Say it out loud.
| Word | What it means | Example |
|---|---|---|
| doer of mathSpanish: persona que hace matemáticas | Anyone who uses mathematical thinking — which is everyone, every day. | Splitting a bill 4 ways at dinner — that is a doer of math. |
| math storySpanish: historia matemática | Your own history with mathematics — what you have done, felt, and learned so far. | “In 3rd grade I hated fractions; this year I can explain them.” |
| strengthSpanish: fortaleza | Something you already do well and can share with others. | “I am good at mental math with money” — a strength you can teach. |
| decomposeSpanish: descomponer | To break a number into parts that add, subtract, multiply, or divide back to it. | 78.5 = 70 + 8.5, and also 157 ÷ 2 — both rebuild the same number. |
| estimateSpanish: estimar | A reasoned answer that is close enough to be useful, without counting every one. | 20 cars × about 4 riders ≈ 80 people on the Ferris wheel. |
How it worksWorked example
These numbers are not on your problems. The steps are. Follow them with your own numbers.
The Ferris wheel has 20 cars, and about 4 people fit in each car. About how many people can ride at one time?
- I count the cars: 20. Then I estimate how many riders fit in one car: about 4.
- I do not count every person — an estimate is a reasoned answer that is close enough to be useful.
- 20 × 4 = 80, so I would say “about 80 people.”
Now you trySame steps, your turn
The steps are the same as the worked example. The numbers are yours. Do the work.
78.5 = 70 + 8.5.
Say it and write itSentence starters
Finish each sentence out loud with a partner. Then use them in your writing.
- is doing math because the person has to .
- I used math when I .
- It was math because I had to .
- One thing I do well is .
Word bank doer of mathmath storystrengthdecomposeestimate
Watch outA common mistake
Believing that 'doing math' only counts when it happens on paper in a classroom.
Lesson 1.1Math is Mine
Version ASupported practice
Learning target I can describe the ways we are all doers of math, and compare my math story with a classmate's.
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1Circle the letter of the best answer. Show how you know.
What does it mean to ESTIMATE how many people are on the Ferris wheel?
- ACount every single person exactly
- BGuess any number at random
- CGive a reasoned answer that is close enough to be useful
- DRefuse to answer without more data
Hint Is an estimate exact?
Show your work
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2Circle the letter of the best answer. Show how you know.
About how many people can ride the Ferris wheel at one time if it has 20 cars that each hold about 4 people?
- AAbout 5
- BAbout 24
- CAbout 80
- DAbout 400
Hint How many groups are there, and how big is each group?
Show your work -
3Circle the letter of the best answer. Show how you know.
Which of these is a correct way to decompose 78.5?
- A7 + 8.5
- B70 + 8.5
- C70 + 8.05
- D78 + 5
Hint Add each option and see what you get.
Show your work -
4Circle the letter of the best answer. Show how you know.
Another correct decomposition of 78.5 is:
- A75 − 3.5
- B80 − 1.5
- C80 − 2.5
- D80 + 1.5
Hint Start at 80. How far down is 78.5?
Show your work
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5Answer in complete sentences.
Name one way you used math outside of school this week.
Sentence starter I used math when I ___ .
It was math because I had to ___ .Write your answer -
6Answer in complete sentences.
Tell one thing you already do well in math.
Sentence starter One thing I do well is ___ .
I know this because ___ .Write your answer
Explain your thinkingYou and your partner each put a card in a different column. Take the one you disagreed about: what has to be true about an activity for it to count as doing math, even when nobody calls it math?
Sentence starter ___ is doing math because the person has to ___.
Lesson 1.1Math is Mine
Version BCore practice
Learning target I can describe the ways we are all doers of math, and compare my math story with a classmate's.
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1Circle the letter of the best answer. Show how you know.
Which statement matches this lesson's big idea?
- AOnly people who are fast at math are doers of math
- BMath only counts when it happens in a classroom
- CEveryone is a doer of math, and we do it in different ways
- DThere is one right way to think about a math problem
Show your work
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2Circle the letter of the best answer. Show how you know.
Which decomposition of 78.5 uses multiplication correctly?
- A39 × 2
- B39.25 × 2
- C39.25 × 3
- D78.5 × 2
Show your work -
3Circle the letter of the best answer. Show how you know.
A Ferris wheel holds about 78 riders per turn and makes 6 turns an hour. About how many riders per hour?
- AAbout 13
- BAbout 84
- CAbout 468
- DAbout 780
Show your work -
4Circle the letter of the best answer. Show how you know.
You estimate 80 riders and the true count is 78. Was your estimate useful?
- ANo — an estimate is only useful if it is exact
- BNo — you should never estimate
- CYes — it was close enough to plan with
- DYes — because any answer is fine
Show your work
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5Answer in complete sentences.
Describe three different situations where you use math in your life. Say how the math is the SAME in each one.
Write your answer -
6Answer in complete sentences.
Ask a family member, classmate, or trusted adult about their math story. How is it different from yours? Working alone: compare your math story now with an earlier memory.
Write your answer
Explain your thinkingYou and your partner each put a card in a different column. Take the one you disagreed about: what has to be true about an activity for it to count as doing math, even when nobody calls it math?
Lesson 1.1Math is Mine
ChallengeExtension
Learning target I can describe the ways we are all doers of math, and compare my math story with a classmate's.
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1Write the letter of the matching item on each line.
Match each number to a correct decomposition.
- 78.5
- 78.5 using multiplication
- 480
- 12.5
- A70 + 8 + 0.5
- B(7 × 10) + (8 × 1) + (5 × 0.1)
- C6 × 80
- D12 + 0.5
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2Circle the letter of the best answer. Show how you know.
Which set shows FIVE different correct decompositions of 78.5?
- A70 + 8.5, 78 + 0.5, 80 − 1.5, 39.25 × 2, 157 ÷ 2
- B70 + 8.5, 78 + 5, 80 − 1.5, 39.25 × 2, 157 ÷ 2
- C70 + 8.5, 78 + 0.5, 80 + 1.5, 39.25 × 2, 157 ÷ 2
- D70 + 8.5, 78 + 0.5, 80 − 1.5, 39.25 × 3, 157 ÷ 2
Show your work -
3Circle the letter of the best answer. Show how you know.
Why does the book start the year with this lesson instead of with computation?
- ABecause there is no mathematics in Unit 1
- BBecause what you believe about yourself shapes how you learn all year
- CBecause sixth graders have forgotten all their math
- DBecause estimating is the hardest skill in the book
Show your work
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4Answer in complete sentences.
Someone says “I'm just not a math person.” Using this lesson, write what you would say back.
Write your answer -
5Answer in complete sentences.
Sharing math strengths helps everyone grow. Name a strength you have that you could TEACH someone, and how you would teach it.
Write your answer