LCM and GCF
Example:
Multiples of 3 are: 3; 6; 9; 12; 15; and so on.
Multiples of 5 are: 5; 10; 15; 20; 25; and so on.
Common multiplies of 3 and 5 are 15, 30, and so on.
A. Complete.
1. LCM of 21 and 14 are ….
2. LCM of 20 and 25 are ….
3. LCM of 10 and 18 are ….
4. CLCM of 9 and 21 are ….
B. Complete
1. GCF of 20 and 50 are ….
2. GCF of 22 and 32 are ….
3. GCF of 24 and 42 are ….
4. GCF of 42 and 56 are ….
C. Solve the problems
1. Joko goes to the library every 8 days, Wiwit every 10 days. If on Monday they go to the library together, when will they go to the library togehter again ?
2. Dani has 56 apples and 48 oranges. The fruits are going to be put equally in several bag. How many bags are required to hold all the fruits?
3. Tari has swimming lesson every 3 days, dancing lesson every 4 days, and Mathematics lesson every 5 days. If all the lesson started at the beginning of the year, how many times will she have?
Answer key:
A.
1. The LCM of 21 and 42 is 42.
2. The LCM of 20 and 25 is 100.
3. The LCM of 10 and 18 is 90.
4. The LCM of 9 and 21 is 63.
B.
1. The GCF of 20 and 50 is 10.
2. The GCF of 22 and 32 is 1 and 2.
3. The GCF of 24 and 42 is 6
4. The GCF of 42 and 56 is 14
C.
1. on Saturday
2. 8 bags
3. 6 times
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