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**WALT: Find the Lowest Common Multiple**

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**What are the multiples of:**

5 10 7 18

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**How do we know if a number is a multiple of:**

2 4 5 10 100

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**Are the following numbers multiples of 2?**

246 1067 20000 Three million

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**Are the following numbers multiples of 4?**

300 235 410 Five hundred and thirty two

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**Are the following numbers multiples of 5?**

1000 25456 5555 1025 Three million two hundred and fifty six

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**Which of the numbers below are multiples of both 2 AND 5?**

Give three numbers which are multiples of 2 and 5. What can you say about numbers which are multiples of 2 and 5?

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**What is a Lowest Common Multiple?**

Consider the numbers 2 and 5 The lowest common multiple is the smallest number which is the multiple of both. Multiples of 2 are: 2, 4, 6, 8, 10, 12, 14, … Multiples of 5 are: 5, 10, 15, 20, 25, … Which is the smallest number that occurs in BOTH lists? This is the LOWEST COMMON MULITPLE.

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**What is the LOWEST COMMON MULTIPLE of:**

2 and 7 3 and 7 5 and 3 5 and 7

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Question: Decide with your partner the answer to the question below. You must EXPLAIN your answer and give examples. Is the lowest common multiple of two numbers always found by multiplying those two numbers together? E.g LCM of 2 and 7 is 2 x 7 = 14

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Find the LCM of: 4 and 40 4 and 8 4 and 6 12 and 4

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Design a poster Make a poster explaining what the Lowest Common Multiple of a pair of number is. Make sure you give some examples Give a method for finding the LCM.

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