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GCF/LCM
Primes
Decimals
Find x
Fractions
100

What is the GCF of 18 and 24?

6

100

Is 17 a prime number?

Yes

100

3.45+2.78

6.23

100

3/5 = x/20

12

100

2/3 + 1/6

5/6

200

What is the GCF of 36 and 48?

12

200

Is 24 a prime number?

No

200

7.50-3.86

3.64

200

4/7 = 12/x

21

200

8/4 - 5/3

19/12

300

What is the LCM of 6 and 8?

24

300

Is 29 a prime number?

Yes

300

2.4 x 1.5

3.6

300

x/5 = 8/20

2

300

5/2 x 2/5

1

400

What is the LCM of 9 and 12?

36

400

Are 9 and 15 relatively prime?

No

400

8.4 divided by 2.1

4

400

7/12 = x/36

21

400

7/2 divided by 7/8

4