Find the value of each expression mentally.

Find the value of each expression mentally.

Find the value of each expression mentally.

Find the value of each expression mentally.

Find the value of 82 - 9.

Show your thinking. Use blocks if it helps.

Diego started with 5 tens and 5 ones. Represent Diego’s blocks with the base-ten blocks.

How many does he have?

Diego took away 2 tens.

• Draw a representation to show what happened to Diego’s blocks.

• Write an equation to show how many Diego has now.

Then, Diego took away 8 ones.

• Draw a diagram to show what happened to Diego’s blocks.

• Write an equation to show how many Diego has now. Be prepared to explain your reasoning.

Find the value of 75 - 9. Show your thinking.