Factors and Multiples

Factors

100

What are the factors of the number 12?

1, 2, 3, 4, 6, 12

200

What are the factors of the number 56?

1, 2, 4, 7, 8, 14, 28, 56

300

What are the factors of the number 72?

1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72

400

What are the common factors of 27 and 45?

Factors of 27: 1, 3, 9, 27 Factors of 45: 1, 3, 5, 9, 15, 45 Common factors: 1, 3, 9

500

What are the common factors of 48 and 96?

Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 Factors of 96: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96 Common factors: 1, 2, 3, 4, 6, 8, 12, 16, 48

Multiples

100

List the first 5 multiples of 10

10, 20, 30, 40, 50

200

List the first five multiples of 30

30, 60, 90, 120, 150

300

List the first 5 multiples of 12

12, 24, 25, 48, 60

400

List 2 common multiples of 4 and 8

Multiples of 4: 4, 8, 12, 16, 20 Multiples of 8: 8, 16, 24, 32, 40 Common multiples: 8 and 16

500

List 2 common multiples of 3 and 6

Multiples of 3: 3, 6, 9, 12, 15 Multiples of 6: 6, 12, 18, 24, 30 Common multiples: 6 and 12

GCF

100

Find the greatest common factor of 14 and 21

Factors of 14: 1, 2, 7, 14 Factors of 21: 1, 3, 7, 21 GCF= 7

200

What is the greatest common factor of 15 and 18?

Factors of 15: 1, 3, 5, 15 Factors of 18: 1, 2, 3, 6, 9, 18 GCF= 3

300

Find the greatest common factor of 42 and 56

Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42 Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56 GCF= 14

400

What is the greatest common factor of 32 and 48?

Factors of 32: 1, 2, 4, 8, 16, 32 Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 GCF= 16

500

Find the greatest common factor of 72 and 81

Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 Factors of 81: 1, 3, 9, 27, 81 GCF= 9

LCM

100

Find the least common multiple of 12 and 8

Multiples of 12: 12, 24, 36, 48, 60 Multiples of 8: 8, 16, 24, 32, 40 LCM= 24

200

What is the least common multiple of 9 and 15?

Multiples of 9: 9, 18, 27, 36, 45 Multiples of 15: 15, 30, 45, 60, 75 LCM= 45

300

Find the least common multiple of 6 and 21

Multiples of 6: 6, 12, 18, 24, 30, 36, 42 Multiples of 21: 21, 42, 63, 84, 105 LCM= 42

400

What is the least common multiple of 5 and 7?

Multiples of 5: 5, 10, 15, 20, 25, 30, 35 Multiples of 7: 7, 14, 21, 28, 35 LCM= 35

500

Find the least common multiple of 10 and 14

Multiples of 10: 10, 20, 30, 40, 50, 60, 70 Multiples of 14: 14, 28, 42, 56, 70 LCM= 70

Bonus Fractions

100

1/5 + 3/5

4/5

200

6/8 - 2/8

4/8 OR 1/2

300

8/10+ 3/5 (mixed number)

LCM of 10 and 5 Multiples of 5: 5, 10 15, 20, 25 Multiples of 10: 10, 20, 30, 40, 50 LCM= 10 8/10 + 6/10= 14/10 OR 1 4/10 OR 1 2/5

400

2 + 4/7 (mixed number)

2/1 +4/7 14/7 + 4/7 = 18/7 OR 2 4/7

500

9 - 2/3 (mixed number)

9/1 -2/3 27/3 - 2/3 = 25/3 OR 8 1/3