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Split to add

Ria has to find :  26 + 13

Splitting 26 and 13 can make it easier to add.

Split to add 26 and 13
 
26   + 13
/ \     / \
20 +   + 10 +

Choose the correct grouping to add 26 and 13:

20 + 6 + 3          20 + 10 + 6 + 3          20 + 30 +6

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