Asked by Janae

Evaluate the expression using mental math. Justify each of your steps.

1) 4(19)(-25)

2) 17+32+23

15 years ago

Answered by bobpursley

Round: 4*20 is about 80, which multiplied by (20+5)=1600+400=2000 about, and it is negative.

That is mental math.

15 years ago

Answered by Janae

Thanks

15 years ago

Answered by bobpursley

and I just saw a shortcut.

take the 4 and 25 first, 100. then times 19, ....

The problem with mental math is we see things with differing mental processes and perspectives, at differing times.

15 years ago

Answered by Alecia

32+16+8. Evalute the expression justify each of ur steps

13 years ago

Answered by Gloria

5ab

9 years ago

Answered by Monaqua walton

(d+a)^2
When d = -11 and a =17

4 years ago

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