Number Theory Review

What is the divisibility rule for 5?

• The digits must add up to 10.
• The last digit needs to be a 5 or 0.
• The last digit can only be a 5.
• The sum of the digits need to be divisible by 5.

Tags

CCSS.5.OA.B.3

Which of the following statements is true of this number?

• It is divisible by 3 and 9

• It is divisible by 2, 3, and 6

• It is divisible by 3

• It is prime

Which number is divisible by 6?

• 45

• 12

• 47

• 92

Tags

CCSS.4.OA.B.4

Which number is a factor of 6?

• 12
• 2
• 8
• 10

Tags

CCSS.4.OA.B.4

Which is a factor pair of 24?

• 2,12

• 3,5

• 7,6

• 8,5

Tags

CCSS.4.OA.B.4

List the first 5 multiples of 8

• 1, 2, 4, 8
• 8, 16, 25, 32, 40
• 8, 16, 24, 32, 40
• 8, 16, 24, 31, 40

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

GCF of 5 and 35

• 7
• 5
• 2
• 35

Tags

CCSS.4.OA.B.4

What is the least common multiple (LCM) of 15 and 2?

• 30
• 2
• 45
• 152

Tags

CCSS.4.OA.B.4

Two neon signs are turned on at the same time. Both signs blink as they are turned on. One sign blinks every 9 seconds. The other sign blinks every 15 seconds. In how many seconds will they blink together again?

• 48 seconds
• 45 seconds
• 16 seconds
• 8 seconds

Tags

CCSS.6.NS.B.4