Posted by Janae on Wednesday, October 13, 2010 at 2:20pm.
Evaluate the expression using mental math. Justify each of your steps.
1) 4(19)(25)
2) 17+32+23

Math  bobpursley, Wednesday, October 13, 2010 at 2:46pm
Round: 4*20 is about 80, which multiplied by (20+5)=1600+400=2000 about, and it is negative.
That is mental math.

Math  Janae, Wednesday, October 13, 2010 at 2:54pm
Thanks

Math  bobpursley, Wednesday, October 13, 2010 at 2:56pm
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.

Math  Alecia, Tuesday, September 18, 2012 at 6:55pm
32+16+8. Evalute the expression justify each of ur steps

Math  Gloria, Tuesday, October 18, 2016 at 7:53pm
5ab
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