Factors
Two numbers that can be multiplied together to equal a product are called...
Factor pairs
a multiple of 2 will be ...
even or odd?
EVEN
If a number is divisible by 10 then it must have a ___ in the one's place
0
Prime numbers have exactly ___ factors
2 factors.
1 and itself
When looking at a number pattern, which place value spot should you look at first?
Ones, tens, or hundreds?
ONES.
look to see if it is changing
The factors of 12 are...
___ ___ ___ ___ ___ ___
1 , 2, 3, 4, 6, 12
1 x 12 = 12
2 x 6 = 12
3 x 4 = 12
List the next 5 multiples of 3:
3, __, __, __, __, ___
3, 6, 9, 12, 15, 18
List the even numbers 1 - 10
2, 4, 6, 8, 10
Composite numbers have more or less than 2 factors?
MORE
What is the next term in this pattern?
3, 6, 9, 12, __
3 pairs
1 x 16
2 x 8
4 x 4
Which is NOT a multiple of 5?
40. 65. 32. 70.
32.
All multiples of 5 end in either 0 or 5
What is the divisibility rule for 3?
If the sum of a number's digits is divisible by 3, then the number is divisible by 3.
example: 117 is divisible by 3 because 1+ 1 + 7 = 9, and i know 9 is a multiple of 3
What is the number 1?
Prime, composite, neither?
Neither
Use the rule to complete the pattern:
RULE: Minus 10
92, __, __, __, __.
92, 82, 72, 62, 52
List the factor pairs of 72 ...
1 x __
2 x __
3 x __
4 x __
6 x __
8 x __
1 x 72
2 x 36
3 x 24
4 x 18
6 x 12
8 x 9
Find the unknown number:
12, 18, 24, __
36.
Each number is multiplied by 12
name 3 numbers greater than 20 that have 5 as a factor
25, 30, 35, 40, 45, etc.
is 18 prime or composite?
Composite.
18 has more than 2 factors
1, 2, 3, 6, 9, 18
Find the Rule:
3, 6, 7, 14, 15, 30, 31
3x2 = 6 6+1 = 7
7x2=14. 14+1=15
15x2=30. 30+1=31
What are the COMMON factors of 24 and 32?
1, 2, 4, and 8.
24: 1, 2, 3, 4, 6, 8, 12, 24
32: 1, 2, 4, 8, 16, 32
Which number is a multiple of BOTH 2 and 5?
16, 20, 24, 25
20
4 x 5 = 20
2 x 10 = 20
Kyle earned $351 last week. He earns $9 per hour. How many hours did her work?
39 hours
I know 351 is divisible by 9 because the digits add to a multiple of 9. 3 + 5 + 1 = 9
List the prime numbers between 2 - 20.
2, 3, 5, 7, 11, 13, 17, 19
Finish the pattern AND find the rule
2, 10, 4, 20, 14, __, __, __
2, 10, 4, 20, 14, 70, 64, 320
Times 5, minus 6
2 x 5 = 10. 10 -6 = 4
4 x 5 = 20. 20 -6 = 14
14 x 5= 70. 70 - 6 = 64
64 x 5 = 320