It is usually easier to convert mixed numbers to improper fractions, do the subtraction (by finding equivalent fractions with the same denominator) and convert any resulting improper fraction to a mixed number:
4 1/4 - 7 1/2 = (4×4+1)/4 + (7×2+1)/2
= 17/4 - 15/2
= 17/4 - (15×2)/(2×2)
= 17/4 - 30/4
= (17-30)/4
= -13/4
= -(3×4+1)/4
= -3 1/4
2 minus 2/5 plus 1/2 minus 4 = -1.9
It is: 4/5 minus 1/2 = 3/10
-1/4
10/12 minus 2/4 is 1/3
-1/2 4/4= 1 1-2= -1 -1/2= negative one half
1/6
1/6
2/5 = 4/10 minus 1/10 is 3/10
3/6 minus 2/8 is 1/4
2 and 1/12 minus 1 and 1/3 = 3/4 or 0.75
It is: 1/2
1 1/4 minus 2/3 is 7/12