# Lesson 2 Add and Subtract With Tens and Hundreds

• Let’s add and subtract tens or hundreds.

## Warm-up Number Talk: Add Multiples of 10

Find the value of each expression mentally.

## Activity 1 Show It with Base-ten Blocks

Use your base-ten blocks to show each number. Then, roll a number cube to see how many tens or hundreds to add or subtract.

1. Show 297.

2. Complete the equation:

2. Show 432.

3. Show 982.

1. Subtract tens.

4. Show 351.

2. Write an equation:

5. Show 805.

1. Subtract hundreds.

2. Write an equation:

## Activity 2 How Many with Base-ten Blocks and Equations

1. Mai has 2 hundreds, 2 tens, and 3 ones. Lin has 4 hundreds.

Represent their values with base-ten blocks or diagrams.

What is the value of their blocks altogether? Show your thinking.

2. Andre has 4 hundreds, 2 tens, and 8 ones.

Represent his value with base-ten blocks or diagrams.

Andre gives 2 hundreds to Clare.

What is the value of his blocks now? Show your thinking.

3. Diego has 6 tens. Tyler has 8 hundreds, 3 tens, and 6 ones.

What is the value of their blocks together? Show your thinking.

4. Elena has 5 hundreds, 7 tens, and 2 ones. She gives 2 tens to Kiran.

What is the value of her blocks now? Show your thinking.

5. Priya has 6 hundreds, 5 tens, and 8 ones. Han gives her 3 hundreds.

What is the value of her blocks now? Show your thinking.

6. Jada has 4 hundreds, 8 tens, and 2 ones. She gives 3 hundreds to Noah.

What is the value of her blocks now? Show your thinking.

## Problem 1

Here are Kiran’s blocks.