Question

write the second and the fourth common multiple of 7 and 9.​

Answer 1

Answer:

Step 1: List a few multiples of 7 (7, 14, 21, 28, 35, 42, . . . ) and 9 (9, 18, 27, 36, 45, . . . . ) Step 2: The common multiples from the multiples of 7 and 9 are 63, 126, . . . Step 3: The smallest common multiple of 7 and 9 is 63.

Answer 2

Given: Numbers 7 and 9

To find: Second and fourth common multiple of 7 and 9

Solution: According to the given problem,

We need to find the 2nd and 4th common multiple of 7 and 9

Steps to be followed:

Step 1: Calculate the L.C.M. of 7 and 9 i.e. the least common multiple of 7 and 9.

Using factor method:

7 = 7 x 1

9 = 3 x 3 x 1

L.C.M. of 7 and 9 = 7 x 3 x 3 = 63

So, the least common multiple of 7 and 9 is 63.

Other common multiples of 7 and 9 would be multiple of their L.C.M i.e. 63

Step 2: Find 2nd and 4th multiple of 63

2nd multiple of 63 = 2 x 63 = 126

4th multiple of 63 = 4 x 63 = 252

Therefore, 2nd and 4th common multiple of 7 and 9 are 126 and 252 respectively.