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11. Select the proper placement for parentheses to speed up the addition for the expression 2 + 9 + 8 + 1
A. (8 + 2) + (9 + 1) B. (9 + 2) + (8 + 1) C. (8 + 9) + (2 + 1) D. (1 + 2) + (9 + 8)

Respuesta :

option A, because you quickly see that each part adds up to 10 so the total must be 20

the answer is c 8+9+2+1

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