12 1/4 - 5 2/3
1. Simplify the whole number functions by multiplying the denominator by the whole number and adding with the numerator.
4*12+1=49 and 3*5+2=17
2. make the answer above the numerator over the same denominator for each;
49/4 - 17/3
3. Since the denominators are not the same or have a constant multiplier, you cross multiple the denominators and the numerators;
3*49 = 147 and 4*17 = 68
and also multiply the denominators; 4*3 = 12
Now make 12 the denominator for both,
147/12 - 68/12
Since you have the same denominator, go ahead and subtract the numerator;
147 - 68 = 79
Now you answer is 79/12.
simplified dy