Check the change: the payment is not the whole banknote
By Erik Nilsen · Kroni3 min read
When your child pays cash, the banknote they hand over is not necessarily what the purchase costs. Their change comes back. A simple check before leaving the till prevents you from later recording the whole note as spent.
Calculate before putting the money away
In this hypothetical example, your child has 150 units in cash and buys an optional item costing 37 units. They pay with a note worth 100 units. The amounts are arbitrary teaching numbers; use the same calculation with actual cash denominations in your own currency.
The correct change is 100 − 37 = 63 units. Your child also has 50 units that were not handed over. After buying, they should therefore have 50 + 63 = 113 units left. The check works backwards too: 150 − 113 = 37 units spent.
If subtraction is difficult, ask your child to count upwards from the price to the note's value. From 37 to 40 is 3; from 40 to 100 is 60; together that makes 63. It is a different route to the same answer, rather than another kind of money.
Keep the receipt and change together
Leave the change visible while checking and keep the receipt. An adult can support the counting and ask calmly if anything does not match. A busy till does not need to become an oral maths test. A short “Could we check the change together?” is enough.
A realistic snag is your child mixing the change with coins already in their pocket. It then becomes unclear whether a difference arose at the till or during counting. Keep the earlier cash separate from the change until the check is finished. If everything has already been mixed, use the receipt and what you know for certain; do not claim an error you cannot explain.
In your family record, the purchase costs 37 units, rather than 100. The 63 units returned are not new income either. If the original 150 was allowance already paid out, spending that cash should not automatically change what the adult still owes.
Finish by asking: “How much did you hand over, how much came back, and what did the item cost?” Your child can show the answer with 100, 63 and 37 without needing particular coins or notes for the exercise.
Carry the calculation into your family agreement
Kroni can keep track of your child's virtual balance. The app does not transfer money, so any actual purchase is paid for outside it. Agree on what you will record, then check the amount with your child afterwards. Do not deduct a possible cost as though the purchase had already happened. Read about allowance in Kroni.
