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April 18, 2014

Homework Help: math mental math help

Posted by marko on Monday, September 10, 2012 at 6:40pm.

i need to use mental math and the distributive property to simplify:
can you pls check if this correct?
a) 19(-6) i got: -114
or do i do like this:
10*(-6)=-60
9*(-6) =-54
-60 + -54= -114

b) 102* $21 i got: $2142
or do i do mental math like this:
100*21 = 2100
2 * 21 = 42
2100 + 42 = $2142


c) 26*97 i got: 2522
or do i do mental math like this:
20 * 97 = 1940
6* 97 = 582
1940 + 582 = 2522

d) 9 * $4.98 i got: $44.82
or do i do mental math like this:

9 * $4.00 = $36.00
9*.98 = 8.82
36.00 + 8.82 = $44.82

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