Common Core: 1.OA.D.8
Problem 21 of 27g1-021
What number is missing? 8 + ? = 11
Try it first
The walkthrough opens once you check an answer.
Solution walkthrough0:38
- Start at 8 on the number line. We want to land on 11.
- Hop and count the hops: 9 is one, 10 is two, 11 is three.
- It took 3 hops. 8 + 3 = 11, so the missing number is 3.
- Count the hops, not the number you start on. Great work!