MathCounts Formulas

1 + 2 + 3 + 4 + ... + n =

What are the first 12 prime numbers?

• 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 33

• 4, 6, 8, 9, 10, 12, 14, 15, 18, 20, 21, 22

• 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31

• 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37

2⁵ =

• 10

• 32

• 64

• 16

2¹⁰ =

• 256

• 2048

• 1024

• 512

What is the formula that relates distance, rate, and time?

What is the formula for the circumference of a circle (distance around a circle)?

What is the formula for the area of a circle (square units inside)?

Pythagorean Theorem:

In every right triangle, what is true about the leg lengths a and b and the hypotenuse length c?

Select all of the Pythagorean Triples.

• 3, 4, 5

• 6, 8, 10

• 5, 11, 13

• 5, 12, 13

• 8, 15, 17