Pi Day Math Competition

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Geometry

Riddles

Numbers

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100

.77/2

A.) .385

B.) 1.54

C.) 3.85

D.) 38.5

A.) .385

100

A rectangle has perimeter 30 cm and area 54 square cm. Its dimensions, in cm, are:

A) 1 and 30

B) 3 and 15

C) 6 and 9

D) 5 and 9

C) 6 and 9

100

If 3 times a number is 48, then one-fourth of the same number is:

A) 16

B) 4

C) 12

D) 30

B) 4

100

Which number is equal to its own reciprocal?

A) 0

B) 1/2

C) 2/3

D) 1

100

Roger said, "Even though we lost the basketball game, I gave it 125%!" What is 125% as a fraction?

A) 4/5

B) 5/4

C) 6/5

D) 125

B) 5/4

200

Which of the following is true:

A) 1/5 > 1/3

B) 2/7 < 1/5

C) 2/3 > 7/10

D) 1/12 < 2/11

200

Estimate the area of this circle? (Use 3.14 as Pi.)

A.) 50 cm squared

B.) 100 cm squared

C.) 200 cm squared

D.) 800 cm squared

C) 200 cm squared

200

I am the smallest one-digit prime number multiplied by the smallest two-digit prime number. What number am I?

A) 18

B) 22

C) 26

D) 33

B) 22

200

The sum of the square root of 25 and the square root of 16 equals:

A) Square root of 5

B) Square root of 9

C) Square root of 64

D) Square root of 81

200

The average of 1/4 and 1/6 is:

A) 5/12

B) 1/5

C) 1/10

D) 5/24

300

Find the missing number: 1/4 + 3/4 = 1/6 + ?/6

A) 3

B) 4

C) 5

D) 3 1/2

C) 5

300

The lengths of the sides of an isosceles triangle are 7 cm and 10 cm. The perimeter of the triangle is:

A) 21 cm

B) 22 cm

C) 23 cm

D) 24 cm

300

If 20 whosits equals 40 whatsits, then 70 whatsits equals:

A) 35 whosits

B) 70 whosits

C) 20 whosits

D) 7 whosits

A) 35 whosits

300

26⁶ =

A) 308,915,772

B) 308,915,774

C) 308,915,776

D) 308,915,778

C)308,915,776

300

1.8 minutes is how many seconds?

A) 111 seconds

B) 110 seconds

C) 109 seconds

D) 108 seconds

400

A bell rings every 2 seconds, and a bird chirps every 3 seconds. If the ring and the chirp occur together right now, they will also occur together in

A.) 40 seconds

B.) 41 seconds

C.) 42 seconds

D.) 43 seconds

C.) 42 seconds

400

The perimeter of a rectangle is 1/8. The sum of the lengths of the two adjacent sides is:

A) 1/18

B) 1/16

C) 2/3

D) 1/4

B) 1/16

400

Asha and Kali each improved their yards by planting rose bushes and ivy. They bought their supplies from the same store. Asha spent $9 on 1 rose bush and 2 pots of ivy. Kali spent $42 on 9 rose bushes and 5 pots of ivy. What is the cost of one rose bush and the cost of one pot of ivy?

A) rose bush: $2, pot of ivy: $4

B) rose bush: $5, pot of ivy: $2

C) rose bush: $3, pot of ivy: $3

D) rose bush: $1, pot of ivy: $4

C) rose bush: $3, pot of ivy: $3

400

The average of all the whole numbers from 1 to 100 is:

A) 49

B) 49 1/2

C) 50

D) 50 1/2

400

The total number of hours in the month of February, 2020 is:

A) 196

B) 696

C) 672

D) 720

B) 696

500

If 1/2 of a number is 12, then 3/8 of the number is:

A) 24

B) 12

C) 9

D) 6

C) 9

500

How many squares (each with a perimeter of 12 cm) can be cut from a square whose perimeter is 48 cm?

A) 4

B) 9

C) 12

D) 16

500

A plane traveled 960 kilometers each way to Miami and back. The trip there was with the wind. It took 8 hours. The trip back was into the wind. The trip back took 16 hours. Find the speed of the plane in still air and the speed of the wind.

A) plane: 56 km/h, wind: 25 km/h

B) plane: 90 km/h, wind: 30 km/h

C) plane: 55 km/h, wind: 22 km/h

D) plane: 48 km/h, wind: 17 km/h

B) plane: 90 km/h, wind: 30 km/h

500

The sum of two whole numbers is 36. Their greatest possible product is:

A) 35

B) 260

C) 320

D) 324

500

Event A occurs every 4 days, Event B occurs every 6 days, and Event C occurs every 8 days. If all three events occur on July 2nd, the next day that they will all occur together is:

A) July 10th

B) July 20th

C) July 26th

D) August 2nd

C) July 26th