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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?

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Great Granddad

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Make 37

Stage: 2 and 3 Challenge Level: Challenge Level:2 Challenge Level:2

What numbers can you make? Do they have anything in common?
Have you made $37$ with a different number of numbers? How many? Do these numbers have anything in common?
What do you notice about the numbers in the bags?