(-21/4) + (9/8) = -4.125
It is: 3+(21/7*8) = 27
0.381
18 + 3 = 21
16 / 8 + 2 * 5 - 21 / 7 = 2 + 10 - 3 (multiplication and division first) = 9
5 divided by 8
2.625
There is no need to simplify this, it is only a sum. 21 + (10/2) - 18 = 8
21.25
1/6 + 4/15 = 5/30 + 8/30 = 13/30
0.381
8/10 + 8/10 + 5/10 = 21/10
8...