Are 25 and 63 compatible numbers?

Answer 1

The answer depends on what you wish to do with them: for example multiply or divide, and also how good your mental arithmetic is.

63 is approx 64 and 64 = 4*16

so 25*63 is approx 25*4*16

= 100*16 = 1600

You can now subtract 25 to give the exact answer as 1575.

Answer 2

They were until 44 got between them.

Answer 3

No, they are not compatible