Because 21/64 = 0.328125 as a decimal
21.3333
3.0476
64 divided by 3 is 21 with remainder 1.
64 divided by 43 equals 1 with a remainder of 21.
21.3333
0.0625
That's the same as -3/4 x 21/16 = -63/64
64 divided into 84 = 0.7619047619047619
1,664 divided by 64 is 26.
64 divided by 4 is 16.
64 divided into 143 = 0.44755244755244755