21 over 40 means that there are twenty one fortieths of a whole. Because there is one fortieth in that fracture it cannot be reduced to another fracture. 20/40 could be simplified into 1/2 because 20 is half of 40. But because it is twenty ONE, it must remain 21/40. The only way to simplify it that I know of would be to make it a decimal number. If you were to convert it to a decimal it would be .525 (21 divided by 40 is .525)
0.05 as a fraction simplified is 1/20
3.23 as a simplified fraction = 323/100
0.76 = 19/25 as a fraction simplified
6.6 as a simplified fraction is 33/5
6.15 is a fraction. It is a fraction in decimal form but that does not stop it being a fraction. And, as a decimal fraction, it cannot be simplified. Its rational equivalent is 615/100 which can be simplified to 123/20.
11/26 is the simplified fraction
0.875 as a simplified fraction is 7/8
0.644 as a simplified fraction = 644/1000 = 161/250
0.2 as a fraction simplified is 1/5.
12 and a half as a simplified fraction is 25/2
10/12 is 5/6 as a simplified fraction
The fraction -8/7 cannot be simplified.