Lesson 6 Subtract Your Way

    • Let’s subtract one-digit numbers from two-digit numbers.

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

Problem 1

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

How many does he have?

Problem 2

Diego took away 2 tens.

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

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

Problem 3

Then, Diego took away 8 ones.

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

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

Practice Problem

Problem 1

Find the value of each difference. Show your thinking.