Lesson 12 Multiply Multiples of Ten

    • Let’s multiply one-digit numbers times multiples of 10.

Warm-up Notice and Wonder: Tens

What do you notice? What do you wonder?

Base ten blocks. 12 tens.

Activity 1 A Whole Lot of Dollars

Problem 1

Six friends are playing a board game that uses play money. The paper bills come in $5, $10, $20, $50, and $100. Every player received $100 to start. Which of the following could be the bills that a player received?

Write an expression to represent the play bills and the amount in dollars.



dollar amount

one $100 bill

four $20 bills

ten $10 bills

ten $5 bills

five $20 bills

twenty $10 bills

twenty $5 bills

two $50 bills

Problem 2

At one point in the game, Noah had to pay Lin $150. He gave her that amount using the same type of bill.

  1. Which bill and how many of it could Noah have used to make $150? Name all the possibilities.

  2. Write an expression for each way that Noah could have paid Lin.

Problem 3

The table shows what the players had at the end of the game. The person with the most money wins. Who won the game?

Write an expression to represent the bills each person has and the amount in dollars.




dollar amount


nine $10 bills and ten $5 bills


fourteen $10 bills


ten $10 bills and three $50 bills


eight $20 bills


six $50 bills


twenty-one $10 bills

Activity 2 Two Strategies

Problem 1

Two students used base-ten blocks to find the value of .

Base ten blocks. 24 tens.
  • Jada counted: 30, 60, 90, 120, 150, 180, 210, 240, and said the answer is 240.

  • Kiran said he knew  is 24, then found to get 240.

How are Jada and Kiran’s strategies alike? How are they different?

Problem 2

Find the value of each expression. Explain or show your reasoning.

Practice Problem

Problem 1

  1. How many tens are there in 50?

  2. How many tens are there in ? Explain your reasoning.

  3. What is the value of ? Explain your reasoning.