What is the LCM of 16 and 21?

What's the Least Common Multiple (LCM) of 16 and 21?

Answer

LCM of 16 and 21 is

336

First common multiples: 336; 672; 1,008; …

336 is divisible by both: 336 ÷ 16 = 21, 336 ÷ 21 = 16 — and 21 and 16 share no factor but 1, so no smaller number is. As a common denominator: multiply the top and bottom of x/16 by 21 and of y/21 by 16.

16 and 21 are coprime (GCF = 1), so their LCM is simply the product: 16 × 21 = 336.

16 = 2⁴

21 = 3 × 7

Prime	16	21	Highest power
2	2⁴	—	2⁴
3	—	3	3
7	—	7	7

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

LCM = 2⁴ × 3 × 7 = 336

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What is the LCM of 16 and 21?. The LCM of 16 and 21 is 336 — the smallest common multiple of both integers.

https://calculat.io/en/number/least-common-multiple-lcm-of/16--21/generated.jpg

LCM Table

Number 1	Number 2	LCM
16	12	48
16	17	272
16	18	144
16	19	304
16	20	80
16	21	336
16	22	176
16	23	368
16	24	48
16	25	400
16	27	432
16	28	112
16	29	464
16	30	240
16	31	496
16	32	32
16	34	272
16	35	560
16	36	144
16	38	304
16	39	624
16	40	80
16	42	336
16	43	688
16	44	176
16	45	720
16	46	368
16	48	48
16	51	816
16	55	880

LCM for 16 and 21

What's the Least Common Multiple (LCM) of 16 and 21?

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LCM Table

FAQ

What's the Least Common Multiple (LCM) of 16 and 21?

How to find the LCM of 16 and 21 using prime factorization?

What is the difference between LCM and GCF?

See Also

Number 1	Number 2	LCM
16	12	48
16	17	272
16	18	144
16	19	304
16	20	80
16	21	336
16	22	176
16	23	368
16	24	48
16	25	400
16	27	432
16	28	112
16	29	464
16	30	240
16	31	496
16	32	32
16	34	272
16	35	560
16	36	144
16	38	304
16	39	624
16	40	80
16	42	336
16	43	688
16	44	176
16	45	720
16	46	368
16	48	48
16	51	816
16	55	880

Number 1	Number 2	LCM
16	12	48
16	17	272
16	18	144
16	19	304
16	20	80
16	21	336
16	22	176
16	23	368
16	24	48
16	25	400
16	27	432
16	28	112
16	29	464
16	30	240
16	31	496
16	32	32
16	34	272
16	35	560
16	36	144
16	38	304
16	39	624
16	40	80
16	42	336
16	43	688
16	44	176
16	45	720
16	46	368
16	48	48
16	51	816
16	55	880

Number 1	Number 2	LCM
16	12	48
16	17	272
16	18	144
16	19	304
16	20	80
16	21	336
16	22	176
16	23	368
16	24	48
16	25	400
16	27	432
16	28	112
16	29	464
16	30	240
16	31	496
16	32	32
16	34	272
16	35	560
16	36	144
16	38	304
16	39	624
16	40	80
16	42	336
16	43	688
16	44	176
16	45	720
16	46	368
16	48	48
16	51	816
16	55	880