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Finding the Lowest Common Denominator (LCD)

Master Math™ ProblemsMaster Math™ Problems

1. Arrange denominators in horizontal row as dividends. Place under upside down division sign

Finding the LowestCommon Denominator

8 16

Master Math™ ProblemsMaster Math™ Problems

1. Arrange denominators in horizontal row as dividends. Place under upside down division sign

2. Find smallest number that divides into two or more denominators an exact number of times — 2. Make this number the divisor

Finding the LowestCommon Denominator

2 8 16

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3. Divide denominators by divisor and write quotients below

Finding the LowestCommon Denominator

2 8 16 4 8

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3. Divide denominators by divisor and write quotients below

4. Find smallest number that divides into two or more quotients an exact number of times — 2. Divide quotients by this divisor and write quotients below

Finding the LowestCommon Denominator

2 8 162 4 8

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2 8 162 4 82 2 42 1 2 1 1

5. Repeat steps 2–3 until no more quotients can be divided. Bring down quotients not divisible by divisor if necessary — 1

Finding the LowestCommon Denominator

Master Math™ ProblemsMaster Math™ Problems

5. Repeat steps 2–3 until no more quotients can be divided. Bring down quotients not divisible by divisor if necessary — 1

6. Multiply all divisors and quotients together to find lowest common denominator — 16

Finding the LowestCommon Denominator

2 8 162 4 82 2 42 1 2 1 1 2 2 2 2 1 1

= 16