Worksheet generator

1.D — 120KA-0036Rate, time, distance

• AI worked out the cycling leg and gave that as the answer, forgetting the walk entirely.
• BI worked out the walking leg and gave that as the answer, forgetting the cycling entirely.
• CI wrote half an hour as 15 minutes instead of 30 and added it to the 90 minute walk.
• EI rounded the cycling leg up to a whole hour instead of keeping it as half an hour.

2.B — 2 hoursKA-0044Combined work rates

• AI subtracted the two times from each other rather than adding the rates.
• CI averaged the two times, which would only be right if the taps took turns instead of running together.
• DI added the two times together, which makes the tank slower with two taps than with one.
• EI used the faster tap's time alone and ignored the contribution of the slower one.

3.B — 4KA-0111Age problems

• AI aged only the child and left the mother's age unchanged.
• CI looked for when the mother is four times as old rather than three times.
• DI used the age difference of 24 and halved it, without checking the ratio it gives.
• EI gave the difference between their ages, which never changes, instead of a number of years.

4.A — 3KA-0116Combined work rates

• BI gave the faster pipe's time on its own, forgetting the slower one helps as well.
• CI halved the slower pipe's time rather than adding the two rates.
• DI averaged the two times, which would only be right if the pipes took turns.
• EI added the two times, which makes two pipes slower than one - an impossible answer.

5.C — 150KA-0117Rate, time, distance

• AI divided 150 by 60 and read the answer as minutes rather than hours.
• BI used 1.5 hours instead of 2.5, dividing 90 by 60 rather than 150.
• DI converted 2.5 hours as two hours and fifty minutes.
• EI multiplied the distance by 60 instead of dividing, then converted.