Prime Time

Find the prime factorization of 36

• 6 x 6
• 2 x 2 x 3 x 3
• 2 x 2 x 2 x 3
• 3 x 3 x 3 x 2

Find the prime factorization in exponential form for 150.

• 5² x 3²
• 5² x 3 x 2
• 5 x 5 x 3 x 2
• 2² x 3 x 5

What number had the prime factorization of 2³ x 3 x 5 x 7²?

• 1,260
• 28
• 5,880
• 210

A number is less than 85.  The number has 28 and 3 as factors.

• 84
• 85
• 28
• 3

Tags

CCSS.4.OA.B.4

• 20(n+30)   and      20 x n + 30 
• 20(n+30)   and   20n + 600
• 20(n+30)   and    20 x n x 30
• 20(n+30)  and   n + 30 

Pete and Joe are local names for lighthouses that guard a particular dangerous section of the coast.  Pete blinks every 16 seconds and Joe blinks every 10 seconds.  They blink together at midnight.  How many seconds will pass before they blink together again?

• 10 seconds
• 16 seconds
• 160 seconds
• 80 seconds

Kelly is packing treat sacks for a party.  Every sack has the same number of treats in it.  Kelly has 35 candy bars and 50 popcorn balls.  What is the greatest number of treat sacks Kelly can make?

• 7 treat sacks
• 5 treat sacks
• 50 treat sacks
• 10 treat sacks

How many of each treat will be in one treat sack?

• 35 candy bars and 50 popcorn balls
• 7 candy bars and 10 popcorn balls
• 5 candy bars and 5 popcorn balls
• 3 candy bars and 21 popcorn balls

What is the greatest common factor of 20 and 32?

• 2
• 4
• 8
• 20

What is the least common multiple of 20 and 32?

• 160
• 640
• 20
• 32