Lesson 15 Decompose a Ten and a Hundred to Subtract
Let’s subtract within 1,000.
Warm-up Choral Count: Hundreds and Tens
Count back by 10, starting at 590.
What patterns do you see?
Activity 1 Elena’s Thinking
Use base-ten blocks or a base-ten diagram to show Elena’s steps.
Finish Elena’s work to find the value of
What is another way you could use numbers or equations to show subtracting by place to find the value of
Activity 2 Walk About and Subtract
Find someone with a different number than you.
Find the difference between your numbers.
Show your thinking.
Trade cards and find a new partner.
Find the value of each difference. Show your thinking.