Prime vs Composite Numbers
What is a prime number?
A number with only two factors — 1 and itself
Round 4.26 to the nearest tenth.
4.3
What is the ratio of 2 apples to 3 bananas?
2:3
What is 25% of 60?
15
Give an example of a composite number.
Answers will vary
Round 5.374 to the nearest hundredth.
5.37
Change the ratio 2:3 to something :9.
6:9
Find 50% of 80.
40
Is 7 a prime or composite number?
Prime
What digit do we look at to round to the nearest tenth?
The hundredths place
If a class has 8 boys and 4 girls, what is the simplified boy:girl ratio?
2:1
How do you turn a percentage into a decimal?
Divide by 100
Why isn’t 1 considered a prime number?
Because it only has one factor, not two
Round 3.245 to the nearest hundredth.
3.25
Write the ratio 5:10 as a fraction.
5/10
What is 10% of 70?
7
What are all the prime factors of 18?
2 and 3
What’s the difference between rounding to the tenth and the hundredth?
Tenth keeps 1 digit after the decimal, hundredth keeps 2
Why do we simplify ratios?
To make them easier to understand
What is 75% of 40?
30