GCF and LCM Decimals

GCF

100

What is the GCF of 12 and 18

6

200

What is the GCF of 12 and 20

4

300

What is the GCF of 12 and 30

6

400

What is the GCF of 32 and 12

4

500

What is the GCF of 8 and 12

24

Decimals

100

3.9 + 2.657 + 5

11.557

200

1.02 - 0.98

0.04

300

0.65 X 5.7

3.705

400

10.8 / 12

0.9

500

48.071 / 5.3

9.07

Vocabulary

100

The largest common factor of two numbers or more.

Greatest Common Factor (GCF)

200

The smallest number (other than zero) that is a multiple of two or more given numbers.

Least Common Multiple (LCM)

300

The product of any number and a whole number.

Multiple

400

A number multiplied by another number to get a product.

Factor

500

A number written as a product of it's prime factors

Prime factorization

LCM

100

What is the LCM of 45 and 15

90

200

What is the LCM of 12 and 20

60

300

What is the LCM of 18 and 27

54

400

What is the LCM of 6 and 14

42

500

What is the LCM of 24 and 32

96

Decimal word problems

100

Tessa bought 3.2 ounces of ham for sandwiches. Each sandwich uses 0.4 ounces of ham. How many sandwiches can she make?

  8 sandwiches

200

Samantha has 13.5 feet of ribbon. She wants to use the ribbon make window hangers that have to require 0.5 of ribbon each. How many window hangers can she make?

27 window hangers

300

Sue bought four binders at $4.95. Gary bought three binders at $7.50. Did Sue or Gary spend more money? How much more?

Gary spent $2.70 more than Sue

400

Telly wants to buy 3 packets of markers for $4.54 and 2 pieces of poster board for $0.99 each. How much will this cost?

$15.60

500

Gus earned $16.90 washing his dad's car, $3.89 washing the dishes, and $5.25 babysitting. After he bought a new CD for $10.56 how much money did he have?

$15.48

GCF and LCM Word Problems

100

There are 72 boys and 90 girls on the math team.

For the next math competition, Mr. Brown would like to arrange all of the students in equal rows with only girls or only boys in each row.

What is the greatest number of students that can be in each row?

18 students in each row

200

Jose is making pretty necklaces for his mom. Red beads come in packages of 10. Yellow beads come in packages of 8. 

What is the least number of beads he could be so there is an equal amount of yellow and red beads with none leftover?

40 beads

300

Mr. Chan has 12 sixth-graders and 18 seventh graders. He wants to divide them into equal groups with the greatest number of students in each. 

How many students should be in each group?

6 students in each  group

400

Bill is buying pens and pencils. Pens come in packages of 24, and pencils come in packages of 18. 

What is the least amount of pens and pencils he could be so there is one pencil to each pen with none leftover?

72 pens and pencils

500

Gregory is out buying sandwich stuff. Bread comes in packages of 15, meat comes in packages of 12, and cheese comes in packages of 40. 

What is the least number of meat, bread, and cheese he could be so there is one meat bread, and cheese to each sandwich with none leftover?

120 (He's having a sandwich party!)