Prime Factorization
Factor Pairs
Greatest Common Factor
Least Common Multiple
100

16

2x2x2x2 or 24

100

59

1;59

100

30 and 5

5

100

7 and 9

63

200

25

5x5 or 52

200

15

1,15;3,5

200

20 and 14 

2

200

8 and 12

24

300
45

5x3x3 or 5x32

300

12

1,12 ; 2,6 ; 3,4 

300

30 and 10

10

300

8 and 10 

40

400

72

2x2x2x3x3 or 23x32

400

100

1, 100; 2, 50; 4, 25; 5, 20; 10, 10

400

24 and 36

12

400

15 and 100

300

500

126

 2 x 3 x 3 x 7 or 2 x 32 x 7

500

36

1, 36; 2, 18; 3, 12; 4, 9; 6, 6

500

100 and 120

20

500

7, 18, and 21

126