Lesson 15 Equal Groups, Larger Numbers

    • Let’s solve some problems with equal groups that have larger numbers.

Warm-up Which One Doesn’t Belong: Rectangles

Which one doesn’t belong?

  1. Area diagram. Gridded rectangle. Top measurement 14, left side measurement 7.
  2. Area diagram. Rectangle divided into 2 parts. One part labeled 70 with a top measurement of 10, the other labeled 21, with a top measurement of 3. Left side measurement 7.
  3. Area diagram. Rectangle divided into 2 parts. One part labeled 70 with a top measurement of 10, the other labeled 28, with a top measurement of 4. Left side measurement 7.
  4. Area diagram. Rectangle. Top measurement 14, left side measurement 7.

Activity 1 Equal Groups, Larger Numbers

Solve each problem. Explain or show your reasoning.

  1. Noah sees a large painted mural that has side lengths of 15 feet and 4 feet. What is the area of the mural?

  2. Noah’s family buys a mosaic that has 12 rows and 8 columns of 1 inch tiles. What is the area of the mosaic?

  3. At the art festival, Noah uses sidewalk chalk to help decorate a rectangular piece of sidewalk that is 6 feet by 14 feet. What is the area of the piece of sidewalk that Noah helped decorate?

  4. At the art festival, Noah buys a pack of stickers. There are 5 sheets and each sheet has 16 stickers. How many stickers are in the pack?

Activity 2 Gallery Walk: Equal Groups, Larger Numbers

As you visit the posters with your partner, discuss what is the same and what is different about the thinking shown on each poster.

Practice Problem

Problem 1

There were 14 days of school in the month. There were 7 hours of school each day. How many hours of school were there during the month?