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.

    1. Add hundreds.

    2. Complete the equation:

  2. Show 432.

    1. Add tens.

  3. Show 982.

    1. Subtract tens.

  4. Show 351.

    1. Add hundreds.

    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.

Practice Problem

Problem 1

Here are Kiran’s blocks.

Base ten diagram. 3 hundreds, 2 tens, 6 ones.

  1. He gives 2 tens to Priya.

    What is the value of Kiran’s blocks now? Show your thinking.

  2. Then Priya gives Kiran 4 hundreds.

    What is the value of Kiran’s blocks now? Show your thinking.