Grade 3 Unit 3
Lesson 6: Use Strategies and Algorithms to Add
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 6: Use Strategies and Algorithms to Add
CC BY 2021 Illustrative Mathematics®
Find the value of each expression mentally.
300 + 156
299 + 156
303 + 156
204 + 376
Two methods of recording the addition of 657 + 286 are shown.
How is the newly composed ten and hundred recorded differently in each method?
Try the second method of recording to add these numbers:
602 + 179
493 + 161
438 + 364
Use a strategy of your choice to find the value of each sum. Show your reasoning. Organize it so it can be followed by others.
199 + 348
264 + 359
Would you use an algorithm or another strategy to find the value of 299 + 179?
Explain your reasoning.
329 + 381
203 + 75
316 + 198
399 + 499
