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Number Detective

Follow the clues to find the mystery number.

Score

There are exactly 3 ways to add 4 odd numbers to get 10. Find all the ways of adding 8 odd numbers to get 20. To be sure of getting all the solutions you will need to be systematic. What about a total of 15 with 6 odd numbers?

Great Granddad

Great Granddad is very proud of his telegram from the Queen congratulating him on his hundredth birthday and he has friends who are even older than he is... When was he born?

Neighbourly Addition

Age 7 to 14 Challenge Level:
This problem was used in a webinar. You might find it useful to watch the webinar footage for some ideas on how to get started with the task.