
Composite
Numbers A “Composite”
number is a number that can be divided by any other number besides
itself. Example Which of these
numbers are composite? 27, 45,
41, 51 27 is composite
because it can be divided by 3 or 9. 45 is composite
because it can be divided by 3, 5, 9, or 15. 41 is not
composite because it can only be divided by one or itself so it is a prime
number! 51 is composite
because it can be divided by 3 or 17. Students can use a
100 chart and circle all of the prime numbers and put an X through all of the
composite numbers. This will save
them time instead of having to figure each number out!
Factors of
Composite numbers Since a
composite number is a number that is divisible by other numbers, factors of a
composite number are the numbers that you can multiply together to get that
number. Example Choose the
correct statement. 7 is a factor of
28. This is true because 7x4 =28 54 is a factor
of 10. This is not correct because you can not take 54 x ? = 10
28 is a factor
of 7. This is not true because you can not take 28 x ? =7 Example List
all of the factors of 48 A. 1, 2, 3, 4, 6, 8, 12, 16,
24, 48
B. 1, 2, 23, 46, 48 C. 1, 2, 3, 4, 5, 6, 8, 12,
15, 22, 24, 48
D. 1, 2, 3, 6, 11, 22, 33, 66 First make a list
of all the factors of 48. 1x48, 2x24, 3x16,
4x12, 6x8. List each number factor
only once. Then put the numbers in numerical order.
So the correct answer would be A. 1, 2, 3, 4, 6,
8, 12, 16, 24, 48 
