Factor is a number that goes into another number exactly with NO decimals or remainders.
Example : 2 is a factor of 6
2 goes into 6 exactly 3 times
2 is NOT a factor of5because 2goes into 5, 2.5 times
Find the factors of 4, 12, 16, 17, 24, 41 and 96. 4- 1, 2, 4 12- 1, 2, 3, 4, 6, 12 16- 1, 2, 4, 8, 16 17- 1, 17 24- 1, 2, 3, 4, 6, 8, 12, 24 41- 1, 41 96- 1, 2, 3, 4, 6, 8, 12, 24, 32, 48, 96 Prime numbers have only 2 factors ( one and itself ) Composite numbers- numbers with more than 2 factors.
Determine weather each number is prime or composite.
1- Special 9- 1, 3, 9 composite 13- 1, 13 prime 28- 1, 2, 16, 28 composite 31- 1, 31 prime 41- 1,41 prime 51- 1, 3, 17, 51 composite A multiple, is the opposite of factor. Example : 10 is a multiple of 2 and 5
L.C.M. is lowest common multiple
3- 3,6 9, 12, 15, 18, 21, 24, 27, 30 ... 4- 4, 8, 12, 16, 20, 24, 28, 32, 36, 40 ... 3 and 4 both have 12 in common. 3 and 4 both have 24 in common. 12 is the lowest common multiple.
HOMEWORK
Find all the factors of 10, 18, 37
Determine which are prime and composite.
2, 11, 17, 27
Find the L.C.M. of
- 2 & 4
- 3 & 5
- 6 & 7
