Sixteen again?

Happy Birthday Ms Tayke!

Ms Tayke does not want anyone to know how old she is. We think she is 391 but she often subtracts 16 from her age to make her feel younger.
How many times can you subtract 16 from 391?

Time left four minutes.

No calculators allowed.

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Topics: Starter | Arithmetic

• 9AM, Southam College
•
• You can only subtract the initial number once, because after that you are subtract that number from a different number.
• Transum,
•
• Well done 9AM, Southam College! Good answer. There are more smart answers to this question lower down this page. The countdown clock above is a distractor, it leads the pupils to think that they are being asked to do a time consuming activity whereas the most efficient strategy would be to a mathematical operation not mentioned in the question at all.

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