What is the LCM of 42 and 45?

"Least Common Multiple" Calculator

What's the Least Common Multiple (LCM) of 42 and 45?

Answer: LCM of 42 and 45 is 630

(Six hundred thirty)

Finding LCM for 42 and 45 using GCF's of these numbers

The first method to find LCM for numbers 42 and 45 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 42 and 45 is 3, so

LCM = (42 × 45) ÷ 3

LCM = 1890 ÷ 3

LCM = 630

Finding LCM for 42 and 45 by Listing Multiples

The second method to find LCM for numbers 42 and 45 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 42: 42, 84, 126, 168, 210, 252, 294, 336, 378, 420, 462, 504, 546, 588, 630, 672, 714

Multiples of 45: 45, 90, 135, 180, 225, 270, 315, 360, 405, 450, 495, 540, 585, 630, 675, 720

So the LCM for 42 and 45 is 630

Finding LCM for 42 and 45 by Prime Factorization

Another method to find LCM for numbers 42 and 45 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:

All Prime Factors of 42: 2, 3, 7 (exponent form: 2¹, 3¹, 7¹)

All Prime Factors of 45: 3, 3, 5 (exponent form: 3², 5¹)

2¹ × 3² × 7¹ × 5¹ = 630

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About "Least Common Multiple" Calculator

This calculator will help you find the Least Common Multiple (LCM) of two numbers. For example, it can help you find out what's the Least Common Multiple (LCM) of 42 and 45? (The answer is: 630). Select the first number (e.g. '42') and the second number (e.g. '45'). After that hit the 'Calculate' button.

Least Common Multiple (LCM) also known as the Lowest Common Multiple or Smallest Common Multiple of 2 numbers - it is the smallest positive integer that is divisible by both numbers

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LCM Table

Number 1	Number 2	LCM
27	45	135
28	45	1260
29	45	1305
30	45	90
31	45	1395
32	45	1440
33	45	495
34	45	1530
35	45	315
36	45	180
37	45	1665
38	45	1710
39	45	585
40	45	360
41	45	1845
42	45	630
43	45	1935
44	45	1980
45	45	45
46	45	2070
47	45	2115
48	45	720
49	45	2205
50	45	450
51	45	765
52	45	2340
53	45	2385
54	45	270
55	45	495
56	45	2520

LCM for 42 and 45

"Least Common Multiple" Calculator

What's the Least Common Multiple (LCM) of 42 and 45?

Finding LCM for 42 and 45 using GCF's of these numbers

Finding LCM for 42 and 45 by Listing Multiples

Finding LCM for 42 and 45 by Prime Factorization

Related Calculations

See Also

About "Least Common Multiple" Calculator

"Least Common Multiple" Calculator

LCM Table

FAQ

What's the Least Common Multiple (LCM) of 42 and 45?

See Also