GCF - easy
GCF - difficult
Prime Factorization
LCM
Reduce
100
GCF of 15 & 20
5
100
GCF of 36, 54
18
100

Prime factorization of 180

22 x 32 x 5

100
LCM of 30, 120
120
100
Reduce 14/49
2/7
200
GCF of 18, 10
2
200
GCF of 36, 72
18
200

Prime factorization of 1000

23 x 53

200
LCM of 25, 30
150
200
Reduce 33/36
11/12
300
GCF of 20, 24
4
300
GCF of 54, 81
27
300

Prime factorization of 555

3 x 5 x 37

300
LCM of 48, 36
144
300
Reduce 36/54
2/3
400
GCF of 45, 36
9
400
GCF of 48, 72
24
400

Prime factorization of 720,000

27 x 32 x 54

400
LCM of 42, 28
84
400

Reduce 196/256

49/64

500
GCF of 42, 28
14
500

GCF of 52 and 91

13

500

Prime factorization of 1,000,000

26 x 56

500
LCM of 12, 80
240
500

Reduce 300/971

Can't its prime

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