Ch 4 Review

Related to Prime Numbers

100

Is 19 a prime number?

Yes

200

What is the next prime number after 7?

11

300

If the directions say "Write this as a product of prime numbers," what are they asking you to do?

Factor tree

400

Write 12 as a product of prime numbers.

3 x 2 x 2 or 3 x 2²

500

Write 100 as a product of prime factors. 

2 x 2 x 5 x 5 or 2² x 5²

GCF

100

When we find factors, are we breaking down the original number or are we multiplying the original number?

Breaking it down

200

Break down the definition of the term "Greatest Common Factor."

GCF is the biggest factor that 2 or more numbers have in common. 

300

Find the GCF of 21 and 48.

3

400

Find the GCF of 9 and 27.

9

500

Find the GCF of 5, 21, and 35.

1 - relatively prime

LCM

100

When we find multiples, are we breaking down the original number or are we multiplying the original number?

Multiples = multiply

200

Break down the definition of the term "Least Common Multiple."

The smallest multiple that 2 or more numbers have in common.

300

Find the LCM of 7 and 21.

21

400

Find the LCM of 4 and 3.

12

500

Find the LCM of 4, 8, and 12.

24

Equivalent Fractions

100

Find x. (Hint: there's an easy way and a hard way)

7/9 = x/45

35

200

Find x. (Hint: there's an easy way and a hard way)

4/5 = x/30

24

300

Reduce 42/35 to simplest form.

6/5

400

Write the fraction 7/4 as a mixed number.

1 3/4

500

Write 4 3/5 as an improper fraction.

23/5

Decimals

100

Write 0.3 as a fraction in simplest form.

3/10

200

Write 0.75 as a fraction in simplest form.

3/4

300

Write 1/5 as a decimal. (answer could be repeating)

0.2

400

Write 2/3 as a decimal. (answer could be repeating)

0.66666...

500

Write 27/20 as a decimal. (answer could be repeating)

1.35