Math
posted by Ruby .
Please check my work.
1) 64 divide 4 = 16
2) 144 divide (9) = 16
3) Simplify 9 and a small 2 = 81
4) Simplify (3) and a small 3 = 27
5) Add 4/11 + 5/11 = 1/11
6) subtract 5/11 [3/11] = 8/11
7) multiply [7/8] • [2/4] = 7/16
8) divide 3.5 5.6 = 0.63
9) classify the given number.
4/9 = Real
10) find the expression.
128 divide 4 and small2 + 61 = 15
11) find the value of expression.
3•45 divide 9  2 (10 6)  4 divide 2 = 13
Please check my work and explain what I have done wrong.

Corrections:
3) (  9 ) * (  9 ) = 81
When you square a negative number you ALWAYS get a positive result.
8) 3.5 / 5.6 = 0.625
10) 128 / ( 4 * 4 ) = 128 / 16 = 8
128 / ( 4 * 4 ) + 6  1 =  8 + 6 + 1 = 3
11) 3 * 45 = 135
135 / 9 = 15
[ 2 ( 10  6 )  4 / 2 ] = ( 2 * 4  4 ) / 2 =
(8  4 ) / 2 = 4 / 2 = 2
( 3 * 45 /9 )  [ 2 * ( 10  6 )  4 ] / 2 =
15  2 = 13
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