Question

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

Answer 1

$7 \frac{7}{8} -3 \frac{1}{4} \\ \\ \frac{7 \times 8 + 7}{8} -3 \frac{1}{4} \\ \\ \frac{56+7}{8} - 3 \frac{1}{3} \\ \\ \frac{63}{8} - 3 \frac{1}{4} \\ \\ \frac{63}{8} - \frac{3 \times 4 + 1}{4} \\ \\ \frac{63}{8} - \frac{12+1}{4} \\ \\ \frac{63}{8} - \frac{13}{4} \\ \\ LCD = 8 \\ \\ \frac{63}{8} - \frac{13 \times 2}{4 \times 2} \\ \\ \frac{63}{8} - \frac{26}{8} \\ \\ \frac{63 - 26}{8} \\ \\ \frac{37}{8} \\ \\ 4 \frac{5}{8} \\ \\ Answer: \fbox {4 \ 5/8} \ or \ \fbox {4.625}$

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