20 Math Riddles for Middle School With Answers

20 Math Riddles for Middle School With Answers


1.A 300 ft. train is traveling 300 ft. per minute and must travel through a 300 ft. long tunnel. How long will it take the train to travel through the tunnel?

Answer

Two minutes because it takes the front of the train one minute and the rest of the train will take two minutes to clear the tunnel.


2.A grandmother, two mothers, and two daughters went to a baseball game together and bought one ticket each. How many tickets did they buy in total?

Answer

Three tickets because the grandmother is the mother of the two daughters who are mothers.


3.Tom is in charge of shipping and he can place 10 small boxes or 8 large boxes into a carton. A total of 96 boxes were sent in one shipment. The number of small boxes was less than large boxes. What is the total number of cartons he shipped?

Answer

11 cartons


4.If a total of 96 boxes are shipped, then the large boxes in the cartons must be a multiple of 8, which means either 16 or 56 large boxes. Since there are more large boxes in the cartons then the small ones, the number of large boxes must be 56. The number of small boxes is reduced to 96 – 56 = 40. Therefore, the total number of cartons shipped can be figured out this way:

56/8 + 40/10 = 7 + 4 = 11

I am a three-digit number. My second digit is 4 times bigger than the third digit. My first digit is 3 less than my second digit. What number am I?

Answer

141


5.I add five to nine and get two. The answer is correct, but how?

Answer

When it is 9 p.m., add 5 hours to it and you will get 2 p.m.


6.When Josh was 8, his brother was half his age. Now that Josh is 14, how old is his brother?

Answer

His brother is 10. Half of 8 is 4, so Josh’s brother is 4 years younger. When Josh is 14, his brother is still 4 years younger, so he’s 10.


7.In an odd little town, was an odd little stream, with odd little fish in an odd little team. A stranger approached a local fisherman and asked him how much his odd little fish weighed. The odd little man replied, “All the fish in this stream weigh exactly 1/2 of a pound plus 1/2 of a fish. Isn’t that odd?” How many pounds does an odd little fish weigh?

Answer

One


8.Leon works at the aquarium. When he tries to put each turtle in its own tank, he has one turtle too many. But if he puts two turtles per tank, he has one tank too many. How many turtles and how many tanks does Leon have?

Answer

One


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

Answer

977 animals (100×2 = 200; 200+800 = 1000; 1000-23 = 977)


10.If you place three matches on a table then tell a friend to add two more matches to make eight, how can he do so?

Answer

Make a Roman numeral five out of two matches and add it to the three to make a Roman numeral eight.


11.There is a clothing store in Smithville. The owner has devised his own method of pricing items. A vest costs $20, socks cost $25, a tie costs $15 and a blouse costs $30. Using the method, how much would a pair of underwear cost?

Answer

$45 because the pricing method consists of charging $5 for each letter required to spell the item.


12.When Mitch was 6 years old, his little sister, Lila, was half is age. If Mitch is 40 years old today, how old is Lila?

Answer

She is 37 years old.


13.If X is an odd number, when a letter is taken away from X and it becomes even. Which is that number?

Answer

Seven (Seven-S=Even)


14.A man is twice as old as his little sister. He is also half as old as their dad. Over a period of 50 years, the age of the sister will become half of their dad’s age. What is the age of the man now?

Answer

He is 50 years old.


15.You are given 3 positive numbers. You can add these numbers and multiply them together. The result you get will be the same. Which are the numbers?

Answer

1, 2, and 3


16.I am a three-digit number. My tens digit is six more than my one’s digit. My hundreds digit is eight less than my tens digit. What number am I?

Answer

193


17.If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?

Answer

Twenty-one


18.How can you take 2 from 5 and leave 4?

Answer

Remove the 2 letters F and E from the word FIVE and you have IV.


19.Using only addition, how can you add eight 8’s to get the number 1,000?

Answer

888 +88 +8 +8 +8 =1,000


20.What can you put between a 7 and an 8 so that the result is greater than a seven, but less than an eight?

Answer

A decimal because 7.8 is greater than 7, but less than 8.

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