What is the GCF of 28, 42 and 70?

What's the Greatest Common Factor (GCF) of 28, 42 and 70?

Answer

GCF of 28, 42 and 70 is

14

Common factors: 1, 2, 7, 14

14 divides all three: 28 ÷ 14 = 2, 42 ÷ 14 = 3, 70 ÷ 14 = 5 — and 2, 3 and 5 have no factor but 1 common to all of them, so no larger number divides all three.

28 = 2² × 7

42 = 2 × 3 × 7

70 = 2 × 5 × 7

Prime	28	42	70	Lowest power
2	2²	2	2	2
3	—	3	—	—
5	—	—	5	—
7	7	7	7	7

— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.

GCF = 2 × 7 = 14

More with these numbers

Related Calculations

GCF Table

1st	2nd	3rd	GCF
28	42	55	1
28	42	56	14
28	42	57	1
28	42	58	2
28	42	59	1
28	42	60	2
28	42	61	1
28	42	62	2
28	42	63	7
28	42	64	2
28	42	65	1
28	42	66	2
28	42	67	1
28	42	68	2
28	42	69	1
28	42	70	14
28	42	71	1
28	42	72	2
28	42	73	1
28	42	74	2
28	42	75	1
28	42	76	2
28	42	77	7
28	42	78	2
28	42	79	1
28	42	80	2
28	42	81	1
28	42	82	2
28	42	83	1
28	42	84	14

GCF for 28, 42 and 70

What's the Greatest Common Factor (GCF) of 28, 42 and 70?

More with these numbers

Related Calculations

See Also

GCF Table

FAQ

What's the Greatest Common Factor (GCF) of 28, 42 and 70?

What prime factors do 28, 42 and 70 share?

Can you get the GCF of 28, 42 and 70 two numbers at a time?

How does the GCF simplify the ratio 28 : 42 : 70?

See Also

1st	2nd	3rd	GCF
28	42	55	1
28	42	56	14
28	42	57	1
28	42	58	2
28	42	59	1
28	42	60	2
28	42	61	1
28	42	62	2
28	42	63	7
28	42	64	2
28	42	65	1
28	42	66	2
28	42	67	1
28	42	68	2
28	42	69	1
28	42	70	14
28	42	71	1
28	42	72	2
28	42	73	1
28	42	74	2
28	42	75	1
28	42	76	2
28	42	77	7
28	42	78	2
28	42	79	1
28	42	80	2
28	42	81	1
28	42	82	2
28	42	83	1
28	42	84	14

1st	2nd	3rd	GCF
28	42	55	1
28	42	56	14
28	42	57	1
28	42	58	2
28	42	59	1
28	42	60	2
28	42	61	1
28	42	62	2
28	42	63	7
28	42	64	2
28	42	65	1
28	42	66	2
28	42	67	1
28	42	68	2
28	42	69	1
28	42	70	14
28	42	71	1
28	42	72	2
28	42	73	1
28	42	74	2
28	42	75	1
28	42	76	2
28	42	77	7
28	42	78	2
28	42	79	1
28	42	80	2
28	42	81	1
28	42	82	2
28	42	83	1
28	42	84	14

1st	2nd	3rd	GCF
28	42	55	1
28	42	56	14
28	42	57	1
28	42	58	2
28	42	59	1
28	42	60	2
28	42	61	1
28	42	62	2
28	42	63	7
28	42	64	2
28	42	65	1
28	42	66	2
28	42	67	1
28	42	68	2
28	42	69	1
28	42	70	14
28	42	71	1
28	42	72	2
28	42	73	1
28	42	74	2
28	42	75	1
28	42	76	2
28	42	77	7
28	42	78	2
28	42	79	1
28	42	80	2
28	42	81	1
28	42	82	2
28	42	83	1
28	42	84	14