Warm-up Number Talk: Subtract a Little More
Find the value of each expression mentally.
Activity 1 How Do You Find the Value?
Find the value of
Show your thinking. Use blocks if it helps.
Activity 2 Subtract with Base-ten Blocks
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 each difference. Show your thinking.