realitycanteen
Answered

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

Answer :

priyapatel0114
The correct answer is c.
JeanaShupp

Answer: (8+2)+(9+1)


Step-by-step explanation:

Given expression : [tex]2+9+8+1[/tex]

To speed up the addition for the expression, we need to make ten such that addition become more easier.

Here we can make groups of numbers such that their sum will be 10.

So we combine 8 and 2 in a parentheses and 9 and 1 in another.

Thus, the given expression will look like

[tex](8+2)+(9+1)[/tex]

[tex]=(10)+(10)=20[/tex]

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