Unit 7 - Lesson 16 - Grade 2: Illustrative Mathematics
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Grade 2 Unit 7
Lesson 16: Subtract Within 1,000
CC BY 2021 Illustrative Mathematics®
Grade 2 Unit 7
Lesson 16: Subtract Within 1,000
CC BY 2021 Illustrative Mathematics®
Lesson: Subtract Within 1,000
Decide if each statement is true or false. Be prepared to explain your reasoning.
2 hundreds + 3 tens + 4 ones = 2 hundreds + 3 tens + 14 ones
2 hundreds + 3 tens + 4 ones =
2 hundreds + 3 tens + 14 ones
2 hundreds + 3 tens + 4 ones = 1 hundred + 13 tens + 4 ones
2 hundreds + 3 tens + 4 ones =
1 hundred + 13 tens + 4 ones
1 hundred + 13 tens + 4 ones = 1 hundred + 12 tens + 14 ones
1 hundred + 13 tens + 4 ones =
1 hundred + 12 tens + 14 ones
Discuss how Jada’s equations match Lin’s diagram.
Discuss how Jada’s equations match Lin’s diagram.
Finish Jada’s work to find the value of 582 - 145.
Finish Jada’s work to find the value of 582 - 145.
Jada is thinking about how to find the value of 402-298.
Jada says she knows a way to count on to find the difference. She showed her thinking using a number line.
Explain Jada’s thinking.
Jada says she knows a way to count on to find the difference. She showed her thinking using a number line.
Explain Jada’s thinking.
Jada says you can’t decompose to find the value of because there aren’t any tens.
Do you agree with Jada? Use base-ten blocks, diagrams, or other representations to show yourthinking.
Jada says you can’t decompose to find the value of because there aren’t any tens.
Do you agree with Jada? Use base-ten blocks, diagrams, or other representations to show your
thinking.
Find the value of each expression in a way that makes sense to you. Show your thinking. Organize it so it can be followed by others.
525 - 214
525 - 214
700 - 589
700 - 589
683 - 398
683 - 398
918 - 608
918 - 608
735 - 457
735 - 457
602 - 487
602 - 487
Cool Down: Find the Difference Your Way
Choose one expression and find the value by subtracting by place.
Show your thinking.
Choose one expression and find the value by subtracting by place.
Show your thinking.
Explain why you chose that expression.
Explain why you chose that expression.
Choose a different expression and find the value using a different method.
Show your thinking.
Choose a different expression and find the value using a different method.
Show your thinking.
Explain why you chose that expression.
Explain why you chose that expression.