Lesson 21 More Practice to Represent and Solve

- Let’s represent and solve more problems.

Warm-up Number Talk: Two Steps

Find the value of each expression mentally.

$20 + (2 \times 3)$
$30 + (4 \times 3)$
$50 + (8 \times 3)$
$99 + (8 \times 3)$

Activity 1 Info Gap: Introduction

Activity 2 Info Gap: Bake Sale

Your teacher will give you either a problem card or a data card. Do not show or read your card to your partner.

Information Gap routine directions for problem card student and data card student.

Pause here so your teacher can review your work.

Ask your teacher for a new set of cards and repeat the activity, trading roles with your partner.

Practice Problem

Problem 1

Andre has 245 cards. He bought 7 more packages of cards. How many cards does he have now?

What information do you need to know to answer the question?
Write an expression to represent the situation. Use a letter for the unknown quantity.