Algebra
Logic
Math League
Riddles
100

Solve for x: 

2x + 6 = 4x - 2

x = 4

100

Using any letter once, what is the smallest number that you can write down in words?

What is ZERO

100

A newspaper advertises that it sells the Sunday paper for one-third the price of the rest of the week’s papers. If a weekly subscription costs between $2.20 and $2.30, what is the cost of one Sunday paper and one daily paper?

a. 56 cents

b. 81 cents

c. 84 cents

d. 87 cents

e. $1.12

What is C, 84 cents.

100

If you multiply this number by any other number, the answer will always be the same. What number is this?

What is zero.

200

Solve for x:

-300 - (-4x) = + -8x 

x = 25

200

A Man carries his son into the hospital because his son has a nail in his foot. The Surgeon then walks in and says "I cannot operate on this boy as he is my son".

What is going on here?


The surgeon is the boy's Mother. 

200

What is the slope of a line parallel to the line of the equation 2x - 5y = 10

a. 2/5

b. -2/5

c. 5/2

d. -5/2

e. -2

What is C, 5/2.

200

What is more useful when it's broken?

What is an egg.

300

What four consecutive integers have a sum of 66? 

What is 15, 16, 17, and 18

300

Four people are traveling to different places on different types of transport.

Their names are: Rachel, John, Mr. Jones and Cindy.

They either went on train, car, plane or ship.

• Mr. Jones hates flying
• Cindy has to rent her vehicle
• John gets seasick

How did they each travel?

There are 3 possibilities:

Cindy: car
Mr. Jones: train
John: plane
Rachel: ship

Cindy: car
Mr. Jones: ship
John: plane
Rachel: train

Cindy: car
Mr. Jones: ship
John: train
Rachel: plane

300

The song “What a Beautiful Life” has the lyric, “Day 18,253, well, honey, that’s fifty years.” If

the lyric was supposed to be exactly correct, by how many days is it wrong?

a. 0 to 1

b. 2 to 4

c. 5 to 7

d. 8 to 10 

e. 11 to 13

What is D, 8 to 10. 

300

What can you hold in your right hand, but never in your left hand?

What is your left hand. 

400

Simplify the expression by multiplying terms: 

6x * 3y * 9x^2y^4

162x^3y^5

400

You have three bags, each containing two marbles. Bag A contains two white marbles, Bag B contains two black marbles, and Bag C contains one white marble and one black marble.

You pick a random bag and take out one marble. 

It is a white marble.

What is 2/3.

400

A store has four open checkout stands. In how many ways could six customers line up at the checkout stands?

a. 210

b. 1296

c. 4096

d. 60480

e. 151200

What is D, 60480.

400

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

What is 977 animals. 

(100 x 2 = 200; 200 + 800 = 1000; 1000 – 23 = 977)

500

Solve for q using the quadratic formula: 

q^2 - 7.5q + 25 = -q^2 - 7.5q 

q = 2.5, 5

500

A poor woman and a rich woman are talking about music.

The poor woman says she has studied music and can find a song with any name in it.

The rich woman says "OK, if you can find a song with my son's name in it, I will give you a thousand dollars. His name is Demarcus-Jabari."

The poor woman gives her answer and is instantly $1,000 richer.

What was her answer?

What is the Happy Birthday song. 

500

Lucia is not yet 80 years old. Each of her sons has as many sons as brothers. The combined number of Lucia’s sons and grandsons equals her age, and her oldest grandson is 29. How old is Lucia?


Lucia is 64.

500

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?

They all made right hand turns.