3. D. 3 1/12
1 1/4 + 1 5/6
find the lcd: 12
1/4×3/3= 3/12
5/6×2/2= 10/12
3+10
(1+1) -------- = 2 13/12 = 3 1/12
12
4. B. 2 17/63 hours
5/9 + 1 5/7
find the lcd: 63
5/9×7/7= 35/63
5/7×9/9= 45/63
35+45
1 --------- = 1 80/63 = 2 17/63
63
5. C. 13/15 hour
3 2/3 - 2 4/5
find the lcd: 15
2/3×5/5= 10/15
4/5×3/3= 12/15
2 25
3 10/15
- 2 12/15
------------
13/15
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Answers & Comments
3. D. 3 1/12
1 1/4 + 1 5/6
find the lcd: 12
1/4×3/3= 3/12
5/6×2/2= 10/12
3+10
(1+1) -------- = 2 13/12 = 3 1/12
12
4. B. 2 17/63 hours
5/9 + 1 5/7
find the lcd: 63
5/9×7/7= 35/63
5/7×9/9= 45/63
35+45
1 --------- = 1 80/63 = 2 17/63
63
5. C. 13/15 hour
3 2/3 - 2 4/5
find the lcd: 15
2/3×5/5= 10/15
4/5×3/3= 12/15
2 25
3 10/15
- 2 12/15
------------
13/15