LCM for 80 and 420

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What's the Least Common Multiple (LCM) of 80 and 420?

Answer

LCM of 80 and 420 is
1,680

First common multiples: 1,680; 3,360; 5,040; …

1,680 is divisible by both: 1,680 ÷ 80 = 21; 1,680 ÷ 420 = 4 — and 21 and 4 share no factor but 1, so no smaller number is. As a common denominator: multiply the top and bottom of x/80 by 21 and of y/420 by 4.

80 = 24 × 5

420 = 22 × 3 × 5 × 7

Prime80420Highest power
2242224
3—33
5555
7—77

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

LCM = 24 × 3 × 5 × 7 = 1,680

More with these numbers

See Also

LCM Table

Number 1Number 2LCM
80180720
801852,960
801953,120
80200400
802053,280
802101,680
802153,440
802301,840
802453,920
802554,080
802754,400
802854,560
802902,320
803001,200
803255,200
803502,800
803555,680
803956,320
80400400
804056,480
804156,640
804201,680
804303,440
804356,960
80440880
804757,600
80480480
804903,920
804957,920
805002,000

FAQ

What's the Least Common Multiple (LCM) of 80 and 420?

LCM of 80 and 420 is 1,680

How to find the LCM of 80 and 420 using prime factorization?

To find the LCM of 80 and 420, find all prime factors of both numbers, then multiply the highest power of each prime factor. The result is 1,680.

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 80 and 420: LCM = 1,680, GCF = 20.

See Also