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# Rod Measures

##### Age 7 to 11Challenge Level

There was a great deal in this problem and James has answered part of it:

Using only three rods with each one not exceeding 10 you can add and minus the following numbers which can go from 1-13.

The three numbers are 9, 3 and 1.

 1 = 1 2 = 3-1 3 = 3 4 = 3+1 5 = 9-3-1 6 = 9-3 7 = 9-3+1 8 = 9-1 9 = 9 10 = 9+1 11 = 9+3-1 12 = 9+3 13 = 9+3+1!

Well done James. Is 13 the largest number and why?

Can any of you help with some of the rest of the question:

In how many ways can you make 10?

What is the maximum number you can make with 4 rods?

Perhaps you can send in some more ideas.