Find the LCM
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Question 1 of 5
1. Question
Find the Lowest Common Denominator (`LCD`) between the numbers:`5 & 8`- (40)
Hint
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The Lowest Common Denominator (LCD) is the lowest number that is a multiple of both said numbers.Method OneStart by listing out the multiples of each numberMultiples of `5`:$$5\;\;10\;\;15\;\;20\;\;25\;\;30\;\;35\;\;40\;\;45$$Multiples of `8`:$$8\;\;16\;\;24\;\;32\;\;40\;\;48$$Identify the smallest number that is both a multiple of `5` and `8`Multiples of `5`:$$5\;\;10\;\;15\;\;20\;\;25\;\;30\;\;35\;\;\color{#CC0000}{40}\;\;45$$Multiples of `8`:$$8\;\;16\;\;24\;\;32\;\;\color{#CC0000}{40}\;\;48$$The LCD of `5` and `8` is `40``40`Method TwoMultiply the two numbers`5xx8` `=` `40` The LCD of `5` and `8` is `40`Note that at times, this method will give out the highest common denominator. So, Method One is more accurate.`40` -
Question 2 of 5
2. Question
Find the Lowest Common Denominator (`LCD`) between the numbers:`8 & 4`- (8)
Hint
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Excellent!
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The Lowest Common Denominator (LCD) is the lowest number that is a multiple of both said numbers.Start by listing out the multiples of each numberMultiples of `8`:$$8\;\;16\;\;24\;\;32$$Multiples of `4`:$$4\;\;8\;\;12\;\;16$$Identify the smallest number that is both a multiple of `8` and `4`Multiples of `8`:$$\color{#CC0000}{8}\;\;16\;\;24\;\;32$$Multiples of `4`:$$4\;\;\color{#CC0000}{8}\;\;12\;\;16$$The LCD of `8` and `4` is `8``8` -
Question 3 of 5
3. Question
Find the Lowest Common Denominator (`LCD`) between the numbers:`3 & 21`- (21)
Hint
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Keep Going!
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The Lowest Common Denominator (LCD) is the lowest number that is a multiple of both said numbers.Start by listing out the multiples of each numberMultiples of `3`:$$3\;\;6\;\;9\;\;12\;\;15\;\;16\;\;18\;\;21$$Multiples of `21`:$$21\;\;42\;\;63$$Identify the smallest number that is both a multiple of `3` and `21`Multiples of `3`:$$3\;\;6\;\;9\;\;12\;\;15\;\;16\;\;18\;\;\color{#CC0000}{21}$$Multiples of `21`:$$\color{#CC0000}{21}\;\;42\;\;63$$The LCD of `3` and `21` is `21``21` -
Question 4 of 5
4. Question
Find the Lowest Common Denominator (`LCD`) between the numbers:`4 & 10`- (20)
Hint
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Great Work!
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The Lowest Common Denominator (LCD) is the lowest number that is a multiple of both said numbers.Start by listing out the multiples of each numberMultiples of `4`:$$4\;\;8\;\;12\;\;16\;\;20\;\;24$$Multiples of `10`:$$10\;\;20\;\;30$$Identify the smallest number that is both a multiple of `4` and `10`Multiples of `4`:$$4\;\;8\;\;12\;\;16\;\;\color{#CC0000}{20}\;\;24$$Multiples of `10`:$$10\;\;\color{#CC0000}{20}\;\;30$$The LCD of `4` and `10` is `20``20` -
Question 5 of 5
5. Question
Find the Lowest Common Denominator (`LCD`) between the numbers:`6 & 7`- (42)
Hint
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Exceptional!
Incorrect
The Lowest Common Denominator (LCD) is the lowest number that is a multiple of both said numbers.Start by listing out the multiples of each numberMultiples of `6`:$$6\;\;12\;\;18\;\;24\;\;30\;\;36\;\;42\;\;48$$Multiples of `7`:$$7\;\;14\;\;21\;\;28\;\;35\;\;42\;\;49$$Identify the smallest number that is both a multiple of `6` and `7`Multiples of `6`:$$6\;\;12\;\;18\;\;24\;\;30\;\;36\;\;\color{#CC0000}{42}\;\;48$$Multiples of `7`:$$7\;\;14\;\;21\;\;28\;\;35\;\;\color{#CC0000}{42}\;\;49$$The LCD of `6` and `7` is `42``42`
Quizzes
- Shaded Fractions 1
- Shaded Fractions 2
- Equivalent Fractions 1
- Equivalent Fractions 2
- Equivalent Fractions 3
- Equivalent Fractions 4
- Simplify Fractions 1
- Simplify Fractions 2
- Simplify Fractions 3
- Find the LCM
- Comparing Fractions 1
- Comparing Fractions 2
- Comparing Fractions 3
- Mixed and Improper Fractions 1
- Mixed and Improper Fractions 2
- Mixed and Improper Fractions 3
- Add and Subtract Fractions 1
- Add and Subtract Fractions 2
- Add and Subtract Fractions 3
- Add and Subtract Fractions 4
- Multiply and Divide Fractions 1
- Multiply and Divide Fractions 2
- Multiply and Divide Fractions 3
- Add and Subtract Mixed Numbers 1
- Add and Subtract Mixed Numbers 2
- Add and Subtract Mixed Numbers 3
- Multiply and Divide Mixed Fractions 1
- Multiply and Divide Mixed Fractions 2
- Multiply and Divide Mixed Fractions 3
- Multiply and Divide Mixed Fractions 4
- Fraction Word Problems: Addition and Subtraction 1
- Fraction Word Problems: Addition and Subtraction 2
- Fraction Word Problems: Addition and Subtraction 3
- Fraction Word Problems: Addition and Subtraction 4
- Fraction Word Problems: Multiplication and Division
- Find the Fraction of a Quantity
- Find the Quantity of a Quantity 1
- Find the Quantity of a Quantity 2
- Find the Fraction of a Quantity: Word Problems 1
- Find the Fraction of a Quantity: Word Problems 2
- Find the Fraction of a Quantity: Word Problems 3
- Find the Fraction of a Quantity: Word Problems 4
- Find the Quantity of a Quantity: Word Problems
- Order of Operations Involving Fractions 1
- Order of Operations Involving Fractions 2