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Math · Grade 2 Math

Chapter 7: Money and Data

Money Problems

Buying, paying, and working out the change.

Lesson
5
Time
About 14 minutes
0 of 8 done

Step 1: Let's Learn

Read it, or press Listen and follow the words.

Buying two things means adding their prices.

Change is a missing part

If you pay 50¢ for a 35¢ item, the change is what fills the gap: 15¢.

Why change is tricky

Paying with a dime for a 6¢ item means breaking that ten into ones. That is place value again.

Do you have enough?

Compare what you have with what it costs before working out anything else.

Three kinds of money question

How much altogether means add the prices. Do I have enough means compare your money with the price. How much change means subtract the price from what you handed over. Identify the kind before you touch the numbers.

Working out change

If a toy costs 65¢ and you pay with a dollar, the change is 100 - 65 = 35¢. Shopkeepers often count up instead: from 65, add 5 to reach 70, then 30 to reach 100 — that is 35. Counting up avoids the subtraction across a zero entirely.

Does the answer make sense

Change must always be less than what you paid. If you hand over a dollar and calculate change of $1.35, something is wrong. Money problems come with built-in reality checks — use them.

Step 2: Try It Yourself

Tap and try it out.

The dashed piece is the change you would get back.
You pay (¢)
It costs (¢)

50 is 15 more than 35.

Step 3: Watch an Example

One step at a time.

Watch Ana Work Out Change

Ana buys a rubber for 35¢ and pays with 2 quarters.

  1. Step 1

    She works out what she handed over: 2 quarters is 50¢.

Step 4: Your Turn

Practice makes it stick.

The Sweet Shop

Problem 1 of 3

A lolly costs 30¢ and a sticker costs 25¢. What do they cost together?

cents

Paying With a Dollar

Problem 2 of 3

Leo pays 100¢ for a 65¢ pen. How much change does he get?

cents

Enough or Not

Problem 3 of 3

Ana has 3 dimes. A pencil costs 45¢. Does she have enough?

Shopping

1 of 3

Pay 50¢ for a 20¢ item. What is the change?

2 of 3

A 40¢ and a 35¢ item. What do they cost together?

3 of 3

Pay 100¢ for a 78¢ item. What is the change?

Step 5: Quick Check

Show what you know.

Question 1 of 2

Pay 75¢ for a 55¢ item. What is the change?

Question 2 of 2

What is change?

What You Learned

  • Add the prices to find the total cost.
  • Change is what fills the gap up to what you paid.
  • Work out what your coins are worth before deciding anything.