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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
5.21 Relation between L.C.M. and G.C.D.


The Product of the numbers = The product of L.C.M. and G.C.D.

Example:
The L.C.M. and G.C.D. of two numbers 144 and 4 respectively. If one of the numbers 36. Find the second number.

Solution:
Let the second number be x.
We know that,
The Product or the numbers = The product of L.C.M. and G.C.D.
36 * x = 144 * 4
x = (144*4)/36
x = 16
Therefore, the second number is 16.

Directions: Solve the following problems. Also write at least five examples of your own.
Q 1: The L.C.M. of 1236 and 1632 is 168,096. Find G.C.D.
24
16
12

 Q 2: The L.C.M. of 620 and 868 is 4,340. Find G.C.D.
124
146
168

Q 3: The L.C.M. and G.C.D. of two numbers 120 and 72 respectively. If one of the numbers 24. Find the second number.
36
24
30

 Q 4: The G.C.D. of 324 and360 is 36. Find their L.C.M.
3460
3240
3580

Q 5: Product of two numbers is 6912 and their G.C.D. is 24. Find L.C.M.
288
340
560

 Q 6: The L.C.M. of 72 and 60 is 360. Find G.C.D.
14
12
18

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 Question 8: This question is available to subscribers only!


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