LCM for 4 and 40

The first method to find LCM for numbers 4 and 40 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 4 and 40 is 4, so

LCM = (4 × 40) ÷ 4

LCM = 160 ÷ 4

LCM = 40

The second method to find LCM for numbers 4 and 40 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48

Multiples of 40: 40, 80, 120, 160, 200, 240, 280, 320, 360, 400, 440, 480, [...], 40

So the LCM for 4 and 40 is 40

Another method to find LCM for numbers 4 and 40 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors: