Ok so um ... When u do multiply number with another number how less than that the number has to be for u to mulipy it and get the answer right

What ever number is the less number to multiplyed to the other number

There is no trick for multiplying where you see how less the number is. When, you multiply it's like a guessing game. You keep on adding it or multiplying it to see if it makes sense.

For example,

If you wanted to find out what times 25 equals 100

You could multiply:

25 times 1=25 25 times 2=50 25 times 3 = 75

25 times 4=100

Or you could add:

25 + 25=50

50+25=75

75+25=100

Either way you do it, 25 times 4=100