Lesson 13 Decompose Tens or Hundreds
Let’s decompose a ten or hundred to subtract.
Warm-up Which One Doesn’t Belong: Blocks and Blocks
Which one doesn’t belong?
Activity 1 Subtract With Base-ten Diagrams
Mai used base-ten blocks to find the value of
Explain what Mai did in Step 2. Show what Mai should do next to find the difference.
Write the matching expression for each diagram. Then find the value of each difference.
Activity 2 Decompose a Ten or Hundred
Find the value of each difference. Show your thinking. Try Mai’s way for one expression.
Share how you found the value of one of the expressions to your partner. Use the sentence frames to help explain:
“First, I …”
“Next, I …”
“Then, I …”
“Last , I …”
Find the value of each difference. Show your thinking.