im having problems taking numbers like 250 and substracting it froma fraction like 3/4

Sometimes it is easier to see it without so many words. See if this helps some

250 = 250/1 So, your problem is 250/1 - 3/4.

The common denominator for 1 and 4 is 4. Therefore, you multiply:

250 x 4 1000

¯¯¯¯‾‾ = ‾‾‾‾ ; now you have like denominators. Last step is to subtract.

1 x 4 4

1000/4 - 3/4 or 1000 - 3

‾¯‾¯‾¯¯ ; Your final answer would be 997/4.

4

If you want to change it to a mixed number, just remember that the line between your numerator and denominator means divide. So, 997 ÷ 4 = 249 with a remainder of 1 (which will be your numerator in the fractional part of your mixed number). Your denominator will be the number you divided by (4). So, your mixed number would be 249 1/4.

Hope that helps some.

1 x 4 4