Question

Find each of the first number is a factor of second or not
(a) 6.84

Answer 1

1×20=20, so put 1 at the start, and put its "partner" 20 at the other end:

1 20

Then try 2. 2×10=20 works, so put in 2 and 10:

1 2 10 20

Then try 3. 3 doesn't work (3×6=18 is too low, 3×7=21 is too high).

Then try 4. 4×5=20 works, so put them in:

1 2 4 5 10 20

There is no whole number between 4 and 5 so you are done! (Don't forget the negative ones).

1 2 4 5 10 20

-1 -2 -4 -5 -10 -20

Is That How The Calculator Works?

Actually the calculator first works out the prime factors, then combines them together to discover all other numbers that can be multiplied to achieve your number.

Answer 2

Hope this helps everyone.