K-5 friendly lesson

One small step at a time.Read the idea, try the activity, and celebrate each win as you go.

Subtract 2-Digit Numbers to 100 (With Regrouping)

🚨 Speed round! You know how to borrow. Now prove that you can do it over and over without any mistakes!

Do this: Read the concept below, then try the quiz or activity.

Lesson 69 of 186

Concept

You possess all the strategies for "borrowing" (regrouping).

🎯 The Regrouping Checklist:
1. Sign Check: Is it a Minus (-)? Okay, we are taking away.
2. Floor Check: Are there more on the floor? (Is the bottom number in the Ones column bigger?).
   * YES: Go next door. Cross out the Ten. Make it smaller. Give the 10 to the One.
   * NO: Stop! Do NOT go next door. Just subtract normally.
3. Subtract Ones.
4. Subtract Tens. (Make sure you use the new, smaller Ten!).

Try it

Lightning Round: Borrowing Edition!

Instructions: Check the Floor. Borrow. Solve.

Round 1: 5 3 - 2 8 -------- * Answer: ___

Round 2: 8 1 - 4 6 -------- * Answer: ___

Round 3: 7 0 - 1 4 -------- * (Hint: 0 is on top. 4 is bigger. Go next door to the 7!) * Answer: ___

Round 4 (The Trap!): 6 5 - 3 2 -------- * (Look at the Ones! 5 is bigger than 2. DON'T BORROW! It's a trap!) * Answer: ___

Complete & Continue →