Priya bought cinema tickets for herself and her cousin. She paid $28.20 in total for one adult ticket and one child ticket. The adult ticket cost $2.00 more than the child ticket. How much did the child ticket cost?
Need a hint?
Draw a bar for the child ticket and a longer bar for the adult ticket. The adult bar is $2.00 longer. What would the total be without that extra $2.00?
Worked answer
- The adult ticket is the child ticket plus $2.00.
- Take away the extra $2.00: $28.20 − $2.00 = $26.20. This is the cost of 2 child tickets.
- Child ticket = $26.20 ÷ 2 = $13.10.
The mistake this question tests
Calculation slip
Splitting $28.20 equally gives $14.10, which is the average of the two tickets, not the child ticket. Taking the whole $2.00 off $14.10 gives $12.10, which is also wrong.
How to fix it at home →Wrong answers children often give:
- $12.10 Calculation slip
- $14.10 Average and total
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