LCM for 42 and 90

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What's the Least Common Multiple (LCM) of 42 and 90?

Answer

LCM of 42 and 90 is
630

First common multiples: 630; 1,260; 1,890; …

630 is divisible by both: 630 ÷ 42 = 15, 630 ÷ 90 = 7 — and 15 and 7 share no factor but 1, so no smaller number is. As a common denominator: multiply the top and bottom of x/42 by 15 and of y/90 by 7.

42 = 2 × 3 × 7

90 = 2 × 32 × 5

Prime4290Highest power
2222
333232
5—55
77—7

— = power 0: the prime is not a factor of this number; the LCM takes it from the number that has it.

LCM = 2 × 32 × 5 × 7 = 630

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LCM Table

Number 1Number 2LCM
422884
4244924
4245630
4248336
4249294
42501,050
42521,092
42532,226
4256168
42581,218
4260420
4263126
42652,730
4270210
4272504
42801,680
428484
42861,806
4290630
4296672
4298294
421002,100
42105210
42126126
421,3652,730

FAQ

What's the Least Common Multiple (LCM) of 42 and 90?

LCM of 42 and 90 is 630

How to find the LCM of 42 and 90 using prime factorization?

To find the LCM of 42 and 90, find all prime factors of both numbers, then multiply the highest power of each prime factor. The result is 630.

What is the difference between LCM and GCF?

LCM (Least Common Multiple) is the smallest number divisible by both numbers, while GCF (Greatest Common Factor) is the largest number that divides both. For 42 and 90: LCM = 630, GCF = 6.

See Also