115k views
5 votes
Select the proper rearrangement and placement for parentheses to speed up the addition for the expression 2 + 9 + 8 + 1 A. (9 + 2) + (8 + 1) B. (8 + 2) + (9 + 1) C. (1 + 2) + (9 + 8) D. (8 + 9) + (2 + 1)

User Krizz
by
6.6k points

2 Answers

4 votes

Pretty sure the correct answer is B.

(8+2)+(9+1)

User Biovisualize
by
7.3k points
4 votes

I would suppose B would be the simplest? because 8 and 2 result to 10 and 9 and 1 result to ten, so then you would just have to add 10 and 10.

User Alexander Malakhov
by
6.9k points