Point to Ponder: HCF and LCM

The HCF and LCM of two numbers are 12 and 5040 respectively. If one of the number is 420, what is the other number?

Describe how you would approach the problem to find the answer.

3 comments:

  1. 12 x 5040 = 60480
    60480 divide by 420 =144

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    Replies
    1. The product of HCF and LCM of two numbers 12 and 5040 is equal to the product of the numbers 420x ? .

      Hence, the answer is 144.

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  2. ans:120
    420=2 index 2 x 3 x 5 x 7 , 12 = 2x2x3 , 5040:2 index 5 , 3 index 2 , 5 index 2 x 7
    so the other number must have the following index notation : 2 index 3 x 3 x 5 = 120

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