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Number Theory

Level 17 / build-up

LCM (<= 18)

4 visual steps / LCM via GCD

1. Find GCD

LCM(12, 18)1. Find GCDGet the shared factor first.1GCD = 6212 x 18 / 63LCM = 36
Get the shared factor first.

Get the shared factor first.

2. Multiply pair

LCM(12, 18)2. Multiply pairMultiply the two original numbers.1GCD = 6212 x 18 / 63LCM = 36
Multiply the two original numbers.

Multiply the two original numbers.

3. Divide GCD

LCM(12, 18)3. Divide GCDDivide by the shared factor.1GCD = 6212 x 18 / 63LCM = 36
Divide by the shared factor.

Divide by the shared factor.

4. Check

LCM(12, 18)4. CheckUse GCD x LCM = product when relevant.1GCD = 6212 x 18 / 63LCM = 36
Use GCD x LCM = product when relevant.

Use GCD x LCM = product when relevant.

Practice Level 17

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

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