Factoring
Which of the following numbers are prime numbers?
1, 2, 3, 4, 5, 6, 7, 8, 9
1, 2, 3, 5, 7
When is a number divisible by 10?
Any time a number ends in 0.
What does the Greatest Common Factor between two numbers represent?
The largest shared factor that can be found between two numbers. (ex. 20 and 24, the GCF is 4)
What does the Least Common Multiple of two numbers represent?
The smallest number that any two given numbers can evenly multiply into.
How do we simplify fractions?
Factor the numerator and denominator, eliminate like factors, then multiply what is left.
Which of the following are prime numbers!
1, 11, 21, 31, 41, 51, 61, 71, 81, 91
1, 11, 31, 41, 61, 71
When is a number divisible by 5?
When the number ends in 0 or 5.
Find the GCF of 36 and 54.
Find the LCM of 6 and 8.
Simplify this fraction:
3/6
1/2
Factor this number down to prime numbers:
60
2, 2, 3, 5
When is a number divisible by 2?
When a number ends in 0, 2, 4, 6, or 8.
Find the GCF of 8 and 12.
4
Find the LCM of 4 and 5.
20
Simplify this fraction:
4/12
1/3
Factor this number down to prime numbers:
210
2, 3, 5, 7
When is a number divisible by 3?
When the sum of the digits can be divided by 3 (ex. 15, 1 + 5 = 6, 6 can be divided by 3).
Find the GCF of 30 and 45.
15
Find the LCM of 6 and 21
42
Simplify this fraction:
35/75
7/15
Factor the following number down to prime numbers:
840
2, 2, 2, 3, 5, 7
When is a number divisible by 4?
When the last two digits can be divided by 4 (ex. 524, the last two digits are 24, which can be divided by 4).
Find the GCF of 34 and 85.
17
Find the LCM of 3 and 13.
39
Simplify this fraction:
64/192
1/3