Find the value of each expression mentally.

1. Choose a teen number card.
2. Build the number on 10-frames.
3. Choose a number card 0–9 to subtract.
4. Find the difference.
5. Write an equation.

My equations:

Pick your favorite equation.

Show how you found the value of the difference. Use drawings, numbers, or words.

Diego plays Number Card Subtraction.
He starts with 15 and picks an 8.
He starts out by doing this:

What can Diego do next to find the difference?

Andre also finds the value of .
He starts out by doing this:

What can Andre do next to find the difference?

Find the value of each difference using Diego’s way or Andre’s way.
Show your thinking using drawings, numbers, or words.