Unit 8 - Lesson 15 - Grade 3: Illustrative Mathematics
star
star
star
star
star
Last updated about 1 year ago
11 questions
Note from the author:
Lesson: Number Talk
1
1
Cool Down: Number Talk Reflection
1
Grade 3 Unit
Lesson 15: Number Talk
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit
Lesson 15: Number Talk
CC BY 2021 Illustrative Mathematics®
Number Talk: Addition (Warm Up)
Find the value of each expression mentally.
1
Question 1
1.
300 + 400
1
Question 2
2.
300 + 437
1
Question 3
3.
321 + 437
1
Number Talk Design 1
Here are three subtraction expressions.
600 - 400
600 - 399
500 - 399
1
Question 5
5.
Think of at least two different ways to find the value of each difference mentally.
1
Question 6
6.
Write a fourth subtraction expression whose value can be found using one of the strategies you thought of.
Number Talk Design 2
Here are two addition expressions.
500 + 199
504 + 199
1
Question 7
7.
Think of at least two different ways to find the value of each sum mentally.
1
Question 8
8.
Write two more addition expressions whose values can be found using the strategies you thought of.
Number Talk Design 3
Question 9
9.
Write three subtraction expressions to complete the Number Talk.
900 - 400
Number Talk Design 4
Question 10
10.
Write four addition or subtraction expressions to create a Number Talk.
Question 11
11.
As mathematicians, we use patterns and things we see happening over and over again to help us reason about new problems. Describe a time today where you did that.