Question

Find the difference: 7 7/8 - 3 1/4=?

Answer 1

`7 (7)/(8) -3 (1)/(4) \\ \\ (7 * 8 + 7)/(8) -3 (1)/(4) \\ \\ (56+7)/(8) - 3 (1)/(3) \\ \\ (63)/(8) - 3 (1)/(4) \\ \\ (63)/(8) - (3 * 4 + 1)/(4) \\ \\ (63)/(8) - (12+1)/(4) \\ \\ (63)/(8) - (13)/(4) \\ \\ LCD = 8 \\ \\ (63)/(8) - (13 * 2)/(4 * 2) \\ \\ (63)/(8) - (26)/(8) \\ \\ (63 - 26)/(8) \\ \\ (37)/(8) \\ \\ 4 (5)/(8) \\ \\ Answer: \fbox {4 \ 5/8} \ or \ \fbox {4.625}`

Answer 2

7 - 3 = 4

1*2/4*2 = 2/8

Now since we have a common denom, we can subtract.

7-2 = 5

5/8 + 4

4 5/8

Answer: 4 5/8