Lesson 18 Money Problems

    • Let’s solve problems with money.

Warm-up How Many Do You See: Groups of Coins

How many coins do you see? How do you see them?

  1. Pennies.
  2. Sets of nickels.
  3. 8 dimes.

Activity 1 Shop for School Supplies



pack of pencils

pencil sharpener



Problem 1

Lin has these coins:

2 quarters, 3 dimes, 1 nickel.
  1. How much money does Lin have for supplies?

  2. If Lin buys an eraser, how much money will she have left? Show your thinking.

Problem 2

Diego has these coins:

1 quarter, 4 dimes, 2 nickels, 5 pennies.
  1. How much money does Diego have for supplies?

  2. If Diego buys a pack of pencils, how much money will he have left? Show your thinking.

Activity 2 Shop with a Dollar

Show your thinking for each problem.




colored pencils

pencil box

glue stick

Problem 1

Clare wants to buy a pencil box and colored pencils.

  1. How much money will it cost?

  2. Clare has $1. How much will she have left?

Problem 2

Tyler wants to buy a notebook and a pencil box. He has $1. How much will he have left?

Problem 3

Andre has $1. He wants to buy a glue stick, a pencil box, and colored pencils. Does Andre have enough money?

Practice Problem

Problem 1

Mai has 92 cents. She gives Lin 38 cents. How many cents does Mai have now?