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Unit 3 - Lesson 19 - Grade 3: Illustrative Mathematics

Last updated about 1 year ago

16 questions

Note from the author:

Instructions

Lesson: Situations and Equations

Cool Down: How Many Beads?

Grade 3 Unit 3
Lesson 19: Situations and Equations
CC BY 2021 Illustrative Mathematics®

Grade 3 Unit 3
Lesson 19: Situations and Equations
CC BY 2021 Illustrative Mathematics®

Notice and Wonder: The Unknown (Warm Up)

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Mai’s Beads

Part 1
Match each diagram with a situation. Be ready to explain your reasoning.

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Part 2
Match each equation with a letter for the unknown quantity to a situation in Part 1.

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Represent, Solve, Explain

Kiran is setting up a game of mancala. He has a jar of 104 stones.

From the jar, he takes 3 stones for each of the 6 pits on his side of the board.

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Andre has 196 beads. He uses 48 beads to make a craft. Then he gives 30 beads to a friend. How many beads does Andre have left?

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Question 15

15.

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Question 1

1.

What do you notice?

Question 2

2.

What do you wonder?

Question 3

3.

Question 4

4.

Explain your reasoning.

Question 5

5.

Question 6

6.

Explain your reasoning.

Question 7

7.

Question 8

8.

Explain your reasoning.

Question 9

9.

Question 10

10.

Question 11

11.

Question 12

12.

Write an equation to represent the situation. Use a letter for the unknown quantity.

Question 13

13.

Solve the problem. Explain or show your reasoning.

Question 14

14.

Explain how you know your answer makes sense.

Write an equation with a letter for the unknown quantity to represent this situation.

Question 16

16.

Solve the problem. Explain or show your reasoning.

Situation 1: Mai had 104 beads. She bought two packs of beads and now she has 124 beads. How many beads were in each pack?

Situation 2: Mai had some beads. She bought 2 more packs of beads and each pack has 10 beads in it. Now she has 124 beads. How many beads did Mai have before?

Situation 3: Mai had 104 beads. She bought 2 more packs of beads and each pack has 10 beads in it. How many beads does she have now?

104 + 2 x 10 = n

Situation 1: Mai had 104 beads. She bought two packs of beads and now she has 124 beads.

Situation 2: Mai had some beads. She bought 2 more packs of beads and each pack has 10 beads in it.
Now she has 124 beads.

Situation 3: Mai had 104 beads. She bought 2 more packs of beads and each pack has 10 beads in it.

104 + (2 x n) = 124

Situation 1: Mai had 104 beads. She bought two packs of beads and now she has 124 beads.

Situation 2: Mai had some beads. She bought 2 more packs of beads and each pack has 10 beads in it.
Now she has 124 beads.

Situation 3: Mai had 104 beads. She bought 2 more packs of beads and each pack has 10 beads in it.

n + 10 + 10 = 124

Situation 1: Mai had 104 beads. She bought two packs of beads and now she has 124 beads.

Situation 2: Mai had some beads. She bought 2 more packs of beads and each pack has 10 beads in it.
Now she has 124 beads.

Situation 3: Mai had 104 beads. She bought 2 more packs of beads and each pack has 10 beads in it.