Math Riddles
(Also known as: random.)
(Also known as: random.)
A farmer has 17 sheep, and all but 9 run away. How many sheep does he have left?
What is 9?
This is the smallest positive integer that has exactly three positive divisors.
What is 4?
This is the number in the blank.
-7, ___, 3, 8
What is -2?
You flip a coin and it lands heads 8 times in a row. This is the probability that the next flip will be a tails.
What is 0.5?
free points !
(if you get this question wrong lord help you)
The number of middle schools in Arcadia that have math circles.
What is 3?
I’m a two-digit even number. I’m equal to 7 times the sum of my digits. This is my smallest possible value.
What is 42?
This is the number of integers between 1 and 100 that are divisible by neither 2 nor 5.
What is 40?
This is the sum of the series 1, 3, 5, 7…99.
What is 2500?
Avik rolls two dice. This is the probability that the absolute difference of his dice (positive difference) is less than 3.
What is 5/6?
The respective grades of your instructors.
What is 12,12,10?
This is a three-digit number. My tens digit is five more than my ones digit. My hundreds digit is eight less than my tens digit.
What is 194?
This is the smallest positive integer x such that x≡ 3 mod 4 and x≡ 1 mod 5.
What is 21?
Ethan is building triangular pyramids of ornges. If the first pyramid has 4 ornges and the second has 10 ornges, this is the amount of ornges in the third pyramid.
What is 20?
A small number of cards has been lost from a complete pack. If I deal among four people, three cards remain. If I deal among three people, two remain and if I deal among five people, two cards remain. This is the number of cards in the deck.
What is 47?
This is what the AMSMC stands for.
What is the Arcadia Middle School Math Challenge?
How many sides does a circle have?
2
This is the largest number of books that cannot be purchased using boxes of 6 and 9.
What is 33?
This will be the 8th term of the series …9, 6, 4…. if 9 is the 3nd term.
3nd
yes
What is 32/27?
Ethan rolls two fair 6-sided dice. If the sum is 7, he wins $10. Otherwise, he loses $1. Is this game in his favor? (Expected Value = sum of (value * probability))
Yes. The expected value of each roll is $0.83.
This is the number of different math circles instructors that have come to Foothills this year.
What is 6?
You see a clock showing 3:15. This is the angle between the hour and minute hands.
What is 7.5 degrees?
This is the units digit for 72023.
A ball is dropped from a height of 12 ft, and each time it strikes the ground, it bounces back to a height of three-fourths the distance from which it fell. Find the total distance traveled by the ball before it comes to rest.
What is "light work 84."?
If Cath Wonder Picks for Pokemon TCG 5 times (each with a hit rate of ⅕), this is the probability that in total she gets 2 hits and 3 regular cards. (equation accepted)
What is 5C2 * (1/5)2 * (4/5)3?
Or 0.2048
The number of meetings we've had this year.
What is 11?