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Number Theory

Level 21 / mastery

LCM (<= 60)

4 visual steps / LCM via GCD

1. Find GCD

LCM(45, 60)1. Find GCDGet the shared factor first.1GCD = 15245 x 60 / 153LCM = 180
Get the shared factor first.

Get the shared factor first.

2. Multiply pair

LCM(45, 60)2. Multiply pairMultiply the two original numbers.1GCD = 15245 x 60 / 153LCM = 180
Multiply the two original numbers.

Multiply the two original numbers.

3. Divide GCD

LCM(45, 60)3. Divide GCDDivide by the shared factor.1GCD = 15245 x 60 / 153LCM = 180
Divide by the shared factor.

Divide by the shared factor.

4. Check

LCM(45, 60)4. CheckUse GCD x LCM = product when relevant.1GCD = 15245 x 60 / 153LCM = 180
Use GCD x LCM = product when relevant.

Use GCD x LCM = product when relevant.

Practice Level 21

Use the visible move, then type only when the answer is clear.

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