Lesson 15 More Factors, More Problems
Let’s solve more multiplication problems.
Warm-up Number Talk: Tens
Find the value of each expression mentally.
Activity 1 Represent Situations with Equations
For each problem:
Write an equation with a symbol for the unknown to represent the situation.
Find the number that makes the equation true. Show your reasoning.
Problem 1
There are 15 plates. Han placed 5 plates on each table. How many tables have plates on them?
Equation:
Solution:
Problem 2
Lin made 6 sandwiches. She used 2 slices of bread for each sandwich. How many pieces of bread did she use?
Equation:
Solution:
Problem 3
Han has 60 ice cubes. The ice cubes are in trays of 10. How many trays of ice cubes does Han have?
Equation:
Solution:
Activity 2 Multiplication Mashup
Solve each problem. Explain or show your reasoning.
Clare has 16 socks. She puts them in piles of 2. How many piles can she make?
Diego has 8 piles of socks. Each pile of socks has 2 socks. How many socks does Diego have?
Andre has 16 socks. He puts them in 8 groups that are the same size. How many socks are in each group?
The store has 9 boxes. Each box has 5 shirts. How many shirts are there?
A store has 80 sweaters. There are 8 sweaters in each pile on a shelf. How many piles of sweaters are on the shelf?
Practice Problem
Problem 1
Solve each problem. Explain or show your reasoning.
There are 6 flowers. Each flower has 5 petals. How many petals are there?
There are 50 petals on some flowers. Each flower has 5 petals. How many flowers are there?