Find the value of each expression mentally.
1
200 + 40 + 7
200 + 40 + 7
1
50 + 300 + 2
50 + 300 + 2
1
40 + 600 + 12
40 + 600 + 12
1
500 + 17 + 130
500 + 17 + 130
Grade 3 Unit 3
Lesson 3: Add Your Way
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 3: Add Your Way
CC BY 2021 Illustrative Mathematics®
Find the value of each expression mentally.
200 + 40 + 7
50 + 300 + 2
40 + 600 + 12
500 + 17 + 130
Find the value of each sum in any way that makes sense to you. Explain or show your reasoning.
325 + 102
301 + 52
276 + 118
Andre found the value of 276 + 118. His work is shown.
Clare found the value of 276 + 118. Her work is shown.
With your partner, discuss:
What’s different about Clare and Andre’s work?
With your partner, discuss:
What’s the same?
Find the value of 258 + 217. Explain or show your reasoning.
298 + 305
