1.

Using brackets, write three pairs of numbers whose sum is 13. Use them to write three equalities.

Answer»

(7 + 6), (8 + 5), (9 + 4). 

since 7 + 6

= 13, 8 + 5 

= 13, 9 + 4 

= 13.

(7 + 6) 

= (8 + 5), (7 + 6) 

= (9 + 4) or (8 + 5) 

= (9 + 4).



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