Teachers, save “Math Challenge: 1.1 NBT Flexible Thinki…” to assign it to your class.

1. Tap 2. Read the challenge. 3. Show your thinking: Option 1: Use tool and illustrate your thinking, then use to explain your thinking. Option 2: Use the and draw and describe your thinking as your draw. 4. Check for quality, make changes as needed. 5. When satisfied, tap