Greatest Common Factor
Find the GCF of 24 and 36.
12
Find the LCM of 6 and 8.
24
Write 12 as a product of prime factors.
2² × 3 (or 2 × 2 × 3)
3/4 ÷ 1/2
3/2 (or 1½)
Rewrite 4(6 + 3) using the distributive property and evaluate.
4·6 + 4·3 = 24 + 12 = 36
Find the GCF of 18 and 48.
6
Find the LCM of 5 and 12.
60
Write 30 as a product of prime factors.
2 × 3 × 5
5/6 ÷ 1/3
5/2 (or 2½)
Rewrite 5(8 + 7) using the distributive property and evaluate.
5·8 + 5·7 = 40 + 35 = 75
Find the GCF of 6 and 21.
3
Find the LCM of 10 and 15.
30
Write 72 as a product of prime factors.
2³ × 3² (or 2 × 2 × 2 × 3 × 3)
7/8 ÷ 2/3
21/16 (or 1 5/16)
Rewrite 3(7 + 9) using the distributive property and evaluate.
3·7 + 3·9 = 21 + 27 = 48
Find the GCF of 12 and 56.
4
Find the LCM of 9 and 12.
36
Write 100 as a product of prime factors.
2² × 5² (or 2 × 2 × 5 × 5)
9/10 ÷ 3/5
3/2 (or 1½)
Find the missing number 7(__+3) = 7·__ + 7·3 = 42+21 = 63
6
Maya has 48 chocolate bars and 36 granola bars. She wants to divide them equally into gift baskets with no bars left over. What is the greatest number of baskets she can make?
12 baskets
Bus A arrives at the station every 12 minutes, and Bus B arrives every 18 minutes. Both buses just arrived at the same time. After how many minutes will they arrive at the station at the same time again?
36 minutes
Write 144 as a product of prime factors.
2⁴ × 3² (or 2 × 2 × 2 × 2 × 3 × 3)
A recipe calls for 2/3 cup of sugar per batch. If you have 4 cups of sugar, how many batches can you make?
6 batches
Find the missing number 9(__+6) = 9·__ + 9·6 = 36+54 = 90
4