Question

LCM of 40 60 and 84​

Answer 1

Answer:

Step-by-step explenation:

=2∠40,60,84

=2∠20,30,42

=2∠10,15,21

=2∠5,15,21

=5∠1,3,21

=3∠1,1,7

=7∠1,1,1

so,

     = 2×2×2×2×2×5×3×7

LCM      =1680

Answer 2

Answer:

5

Step-by-step explanation:

We have to calculate the smallest number that is multiplied with 980 to make the product is a perfect square.

Let us factorize the number 980.  

We will get that, 980=2×7×7×2×5.

Make the factors in pair like 980 =(2×2)×(7×7)×5

So, the only non-paired number is 5.

Hence, we have to multiply another 5 to make all the factors in pairs.

We know that the square root of (2×2)×(7×7)×(5×5) is possible and it is 2×7×5 i.e. 70.  

Therefore, the smallest number that has to multiply with 980 to make the product a perfect square is 5. (Answer)