Prime factors, LCM, HCF

A prime number is...

• a number that has only one factor.
• a number that has at least two factors.
• a number that has more than two factors.
• a number that has only two factors.
  (1 and itself)

Tags

CCSS.4.OA.B.4

Joe has listed the first 4 multiples of 7 as: 
7   14    22     28
Which one is incorrect?

• 7
• 14
• 22
• 28

Tags

CCSS.4.OA.B.4

Find the HCF of 21 and 28

• 3
• 4
• 7
• 14

Tags

CCSS.6.NS.B.4

Which answer lists all the factors for 40?

• 1,2,4,5,8,12,14,40

• 1,2,3,4,5,8,10

• 1,2,4,5,8,10,20,40

• 1,2,4,5,6,7,8,9,10

Tags

CCSS.4.OA.B.4

Find the LCM of 12 and 16...

• 48

• 36

• 64

• 96

Tags

CCSS.6.NS.B.4

Which of these numbers is not prime?

• 17

• 25

• 23

• 37

Tags

CCSS.4.OA.B.4

Name the 5th prime number.

• 2

• 11

• 5

• 7

Find the HCF for 18, 36, and 81

• 3

• 2

• 6

• 9

Tags

CCSS.6.NS.B.4

Sophie checks her bike for repairs every 9 days and Susan check hers every 12 days. If they both check their bikes today, after how many days do they next both check their bike again?

• HCF

• LCM

Tags

CCSS.6.NS.B.4

There are two loaf cakes. One is 35cm long and one is 21cm long. They want to cut the cake up and sell the slices, but all the slices must be equal. What is the largest slices that they can cut them into?

• HCF

• LCM

Tags

CCSS.6.NS.B.4