Math Puzzles/Riddles

Front

How many total squares are there in a 3x3 grid?

Back

14

Front

If Jake is 20 years old today and was 8 when his brother Shawn was half his age, how old is Shawn now?

Back

16

Tags

CCSS.3.OA.D.8

Front

If eggs cost $0.12 a dozen, how many eggs can you buy for a dollar?

Back

100

Tags

CCSS.6.RP.A.3B

Front

If three ostriches lay three eggs in three minutes, how many ostriches are needed to produce 700 eggs in 700 minutes?

Back

3

Tags

CCSS.7.RP.A.2C

Front

If it took 6 people 9 hours to build a barn, how long would it take 12 people to build the same barn?

Back

none

Tags

CCSS.6.RP.A.3B

Front

What is the formula for calculating the area of a rectangle?

Back

Area = length × width

Tags

CCSS.3.MD.C.7B

CCSS.4.MD.A.3

Front

What is the sum of the angles in a triangle?

Back

180 degrees

Tags

CCSS.8.G.A.5

Front

What is the difference between a prime number and a composite number?

Back

A prime number has exactly two distinct positive divisors (1 and itself), while a composite number has more than two divisors.

Tags

CCSS.4.OA.B.4

Front

What is the least common multiple (LCM) of 4 and 6?

Back

12

Front

What is the greatest common divisor (GCD) of 8 and 12?

Back

4