Find Lowest Common Multiple (LCM) in Maths
Grade 7 Maths Questions With Detailed Solutions
How to find the lowest common multiple (LCM) of two (or more) numbers in maths? Grade 7 maths questions are presented along with detailed solutions. Detailed Solutions and explanations are included.
What is the lowest common multiple (LCM) of two or more whole numbers?
Examples: Find lowest common multiple of the numbers 6 and 8. List the first few multiples of both numbers and stop as soon as you find a common multiple. 1) Multiply 6 by 1, 2, 3,.. to obtain the first few multiples of 6: 6, 12, 18, 24, 30, 36 ... 2) Multiply 8 by 1, 2, 3,.. to obtain the first few multiples of 8: 8, 16, 24,32 ,40 ... Examine the multiples: The lowest common multiple of of 6 and 8 is 24. Method 2: It uses prime factorization may be used for all numbers Examples: Find lowest common multiple (LCM) of the numbers 42 and 60. step 1  The prime factorization of 42 is: 42 = 2 × 3 × 7 step 2  The prime factorization of 60 is: 60 = 2^{ 2} × 3 × 5 step 3  The LCM is given by product of all prime number in the prime factorization with the highest power. A Lowest Common Multiple Calculator (LCM) may be used to check your answers.

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