MPP.3 Group 2 · Challenge

Practice Set · Part 1

Math is Mine

Pick up where we left off

Name: Date: Group:

Where we left off

Our goal: I can describe the ways we are all doers of math, and compare my math story with a classmate's, explain how I can tell, and judge a case I have not seen before.

The big idea: Know which way you rounded, because rounding down gives a low estimate and rounding up gives a high one.

Model to copy — Example · Too high or too low?

  1. A Ferris wheel has 21 cars. Each car holds 5 people. Sam rounds 21 to 20 to estimate. Can one turn carry a line of 102 people?
  2. Estimate with the rounded number: 20 × 5 = 100
  3. Compare the estimate to the line: 100 < 102
  4. Find the exact number of seats: 21 × 5 = 105
  5. Compare the exact number to the line: 105 > 102
  6. Yes. One turn carries 105 people, and 105 > 102. The estimate of 100 was too low because Sam rounded down.

Start here

You did these with your group. Now do them on your own — the model above is yours to copy.

  1. 1

    Same stepsFinish what the group started. Use the model above, step for step.

    Try it together — then prove it: Write 78.5 in different ways. Then explain why a subtraction can name the same number. Write 78.5 as 70 plus a number. (78.5 = 70 + 8.5) Write 78.5 as 80 minus a number. (78.5 = 80 − 1.5) Write 78.5 as a number times 2. (78.5 = 39.25 × 2) Why do 70 + 8.5 and 80 − 1.5 name the same number? (Both land on the same point. 78.5 is 8.5 more than 70 and 1.5 less than 80.)
    Show your work
  2. 2

    Warm restartWhich expression shows 4 groups of 5 students?

    1. A4 × 5
    2. B4 + 5
    3. C5 − 4
    4. D5 ÷ 4

    How do you know?

  3. 3

    Warm restartWhat is 40 ÷ 10?

    1. A4
    2. B10
    3. C30
    4. D400

    How do you know?

  4. 4

    Warm restartYou have 3 bags with 5 apples in each bag. How many apples in all?

    1. A2 apples
    2. B8 apples
    3. C15 apples
    4. D35 apples

    How do you know?

1.1 Small Group · Group 2 · Practice SetPart 1 of 4
MPP.3 Group 2 · Challenge

Practice Set · Part 2

Math is Mine

Keep going

You answered these out loud. Now write them.

Answer, then say how you know — the reason is the part that counts.

  1. 5

    Think it throughThe lesson says, “What we believe about ourselves, about others, and about what we are learning shapes us.” Why does the Strengths Inventory ask you to name a growth area, not only a strength?

    1. AGrowth areas are only for students who are behind in math
    2. BNaming what you want to grow shapes how you approach learning all year, just as naming a strength does
    3. CThe growth area replaces the strength, since you can only claim one
    4. DNaming a growth area has nothing to do with your beliefs about yourself

    Why is that the answer?

  2. 6

    Think it throughOne student's math story says she liked math more once she started drawing problems; another's says he liked it more once he memorized steps. What is the point of hearing a classmate's story that is DIFFERENT from yours?

    1. AIt shows there is more than one valid way to be a doer of math, and you might borrow a new strategy
    2. BWhichever method is faster is the “right” one, so you should switch to it
    3. CIf a classmate's story differs from yours, one of you must be doing math wrong
    4. DIt doesn't matter — you only need to hear stories similar to your own

    How do you know? Give a second reason as well.

  3. 7

    Think it throughWhich of these is the BEST example of a specific math strength for the Connect prompt?

    1. A“I'm good at math”
    2. B“I can explain my thinking out loud so others can follow my steps”
    3. C“I got an A last year”
    4. D“Math is easy for me”

    Explain your thinking. What would have to change for a different choice to be right?

  4. 8

    Back to the modelThe Ferris wheel has 20 cars, and you estimated about 4 riders fit in each car. Why is 20 × 4 an estimate and not an exact count?

Sort it again — on paper this time

Write the letter of the group each one belongs in.

A — This is doing mathB — Most people don't call this math
1.1 Small Group · Group 2 · Practice SetPart 2 of 4
MPP.3 Group 2 · Challenge

Practice Set · Part 3

Math is Mine

Words and reasoning

Word bank · Banco de palabras

doer of math (persona que hace matemáticas)math story (historia matemática)strength (fortaleza)decompose (descomponer)estimate (estimar)

Use the words

Fill each blank with a word from the bank.

Explain the thinking

  1. 9

    Find the mistakeAnother student made this exact mistake in this lesson. Explain why it is wrong, then write what they should have done.

    The mistake: Believing that 'doing math' only counts when it happens on paper in a classroom.
  2. 10

    Say moreYou sorted cards like 'splitting a pizza fairly' and 'choosing the shorter line' as doing math. What do all eight cards have in common that makes them math, even though none of them looks like a worksheet?

  3. 11

    Write your ownWrite your own problem about this situation, then solve it and show the answer. The situation: A Ferris wheel turns slowly against the evening sky. Each car is filling with riders as the line moves forward.

    Show your work
1.1 Small Group · Group 2 · Practice SetPart 3 of 4
MPP.3 Group 2 · Challenge

Practice Set · Part 4

Math is Mine

Show what you know

Last check

  1. 12

    Show what you knowExplain your thinking — Which statement best shows what this lesson means by “we are all doers of math”?

    1. AEveryone gets the same score if they try hard enough
    2. BEveryone must solve problems the same way to be correct
    3. COnly the fastest students are really doing math
    4. DEveryone uses mathematical thinking daily, in different ways, and sharing those ways helps us grow

    Explain your choice.

Be honest — this tells your teacher what to do next

I can…Not yetGetting thereGot it
I can describe the ways we are all doers of math, and compare my math story with a classmate's, explain how I can tell, and judge a case I have not seen before.
I can explain why it works: Know which way you rounded, because rounding down gives a low estimate and rounding up gives a high one.
I can justify my answer to a skeptic and connect it to a second strategy or representation.

One question I want to ask my group next time