Question

two common multiple 78 and65

Answer 1

Hey mate !!

Here's the answer !!

The 2 common multiples can be found out using LCM method.

LCM of 65 and 78 is 13 * 6 * 5 = 390

Since 390 is a multiple of 65 and 78, the multiple of 390 is also the multiple of 65 and 78.

Hence 390 * 2 = 780 is also the multiple of 65 and 78.

Hence the first 2 common multiples of 65 and 78 are 390 and 780.

Hope my answer helped you !!

Cheers !!

Answer 2

hye

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aim:we have to find 2 comon multiples of 78 and 65

let us recall a property

→ lcm of 2 numbers is multiple of that 2 numbers←

first let us find the lcm of 78 and 65

=>prime factorisation of  78 =  2 x 3 x 13

=> prime factorisation of  65 = 5 ×13

common factors =  2 x 3 x 5 x 13 

                    l c m = 390

so one common mutiple is 390

now let us recall another property

→if a number is divisible by lcm [of 2 numbers] ,then that number is also divisible by these 2 numbers ←

so let us multiply 390 *2 = 780

∴780 is another common multiple

∴390 and 780 are the 2 common multiples of 78 and 65

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hope it helps u.............