Money Maths for Kids: Dollars, Cents and Change

Money questions combine maths with a familiar everyday task: deciding whether you have enough and checking what should be left. Start with a small written price list and pretend money. No actual shopping is needed.

The Pi Leo Academy money Short introduces this learning area. The shopping example below is an extra activity to try alongside it, with clear steps for adding a cost and finding change.

Keep dollars and cents together

One dollar is 100 cents. A price of $2.40 means 2 dollars and 40 cents, not 2 dollars and 4 cents. When writing prices underneath each other, line up the decimal points so the dollars, tenths and hundredths are in matching columns.

Imagine a notebook costs $2.40 and a pencil costs $1.35. Add the dollars: $2 + $1 = $3. Add the cents: 40c + 35c = 75c. The total is $3.75.

Find change by counting up

If you pay with $5, count from $3.75 to $4: that is 25 cents. Then count from $4 to $5: that is another dollar. The change is $1.25. Check by adding the cost and change: $3.75 + $1.25 = $5.00.

This method keeps the meaning visible. Subtracting $5.00 − $3.75 is another valid approach when the learner understands the regrouping. Whichever method they choose, include the currency unit in the answer.

Try a small shopping challenge

1. A pen costs $1.20 and a ruler costs $2.30. What is the total?
2. You pay $10 for an item costing $6.75. What change should you receive?

Answers: 1. $3.50. 2. $3.25: count 25c to $7, then $3 to $10. All prices in these examples are invented for practice.

Explain whether the answer makes sense

Before calculating, notice that $2.40 plus $1.35 is less than $4, so the change from $5 must be more than $1. An estimate helps check the size of an answer; it does not replace the exact calculation. These exercises practise exact amounts in five-cent steps, so no cash-rounding step is needed.

For a family activity, make a tiny pretend shop with three prices. Let your child choose two items, calculate the total and check the change. Swap roles so they also explain a solution to you.

Keep the study notes beside you

• Practical problems and financial contexts: open study notes · Member study-note PDF
• Decimal place value: open study notes · Member study-note PDF

Full study notes and their PDF downloads require an account with the relevant access. Open the notes page first if you need to sign in or choose a membership. These are companion resources for the activity in this article.

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