 Announcing Bridges in Mathematics Third Edition!

See what’s new in the curriculum!

# Numbers on the Move

Practices
Contextualizing and decontextualizing
Explaining and justifying
Noticing and using mathematical structure
Representing and connecting
Topics
• Place value
• Subtraction
2
3
Use an App Number Pieces
1WT8-W9CK Number Line
4K3Y-07L9

How could you make both sides of the equation equal? Use the numbers 1–9 to make the equation equal. You may use each number only once (you won't use them all).
What numbers can you use to make the equation equal?

______  ______  +  ______  =  ______  ______  -  ______

How could you get started?
• If it’s helpful, choose one side of the equation to focus on. Once you solve that side, then see what numbers you can use to make the other side equal.
• What 2-digit number could you make in the first spot? What 1-digit number could you add to that?
• What is the greatest number you can make?
• What is the smallest number you can make?
• Can you write a problem like this one?