product of hcf and lcm quick way to calculate

2:26

7:39

2:02

1:42

1:33

3:11

7:29

1:47

9:45

1:53

1:13:21

8:14

1:53

4:38

5:15

8:59

6:39

3:50

2:16

4:22

4:03

3:10

8:58

8:58

8:58

4:03

5:12

8:58

17:09

2:45

2:08

9:49

15:11

6:28

3:05

9:59

5:08

4:08

5:08

5:08