math riddles

Sally is 54 years old and her mother is 80, how many years ago was Sally’s mother 3 times her age?

• 12 and 36

• 15 and 45

• 13 and 39

• 9 and 36

There is a three-digit number. The second digit is four times as big as the third digit, while the first digit is three less than the second digit. What is the number?

• 141

• 411

• 114

• 441

Does a convex shape curve inward or outward?

• Inward

• outward

How many feet are in a mile?

• 6 feet

• 144 feet

• 1092 feet

• 5280 feet

Is negative four a natural number

• yes

• no

Which is longer radius or a diameter?

• Diameter

• Radius

Which is worth 3.14

• Area of Circle

• Circumference of a circle

• pi

• Volume of a circle

What flat image can also be displayed in 3D?

• box

• hologram

• A tripod

• camera

What number does a giga stand for?

• Million

• Billion

• Trillion

• Gazillion

How many equal sides do Icosahedrons have?

• 10

• 15

• 20

• 25