what is 12 and 1 half subtracted by 7 2 fifths
[12 + 1/2 ] - [ 7 + 2/5 ] =
25/2 - 37/5 common den. = 10
[25 * 5] / 10 - [37 * 2] / 10 =
125 / 10 - 74 / 10 =
51 /10
