50 Intelligent Math Mind Teasers (Plus Solutions!)
There’s no higher solution to encourage outside-the-box considering than math mind teasers! They’re often far more about utilizing logic than being a math whiz, so everybody might want to assume creatively. Listed here are a few of our favourite math mind teasers for college students of all ages, that are good for bell ringers, further credit score, or to fill the previous few minutes on the finish of sophistication.
Plus, click on the button beneath to obtain a Google Slideshow with all of our math mind teasers in an easy-to-present format!
Our 50 Math Mind Teasers
1. Utilizing solely addition, add eight 8s to get the number one,000.
Reply: 888 + 88 + 8 + 8 + 8 = 1,000.
2. Two years in the past, I used to be thrice as outdated as my brother was. In three years, I will probably be twice as outdated as my brother. How outdated is every of us now?
Reply: The older brother is 17, and the youthful brother is 7.
3. If a hen and a half lays an egg and a half in a day and a half, what number of eggs will half a dozen hens lay in half a dozen days?
Reply: 2 dozen, or 24 eggs.
4. When does 9 + 5 = 2?
Reply: Once you’re telling time. 9:00 + 5 hours = 2:00.
5. A farmer had 17 sheep. All however 9 of them ran away. What number of sheep does she have left?
Reply: 9.
6. A boy is 2 years outdated. His brother is half as outdated as him. When the primary boy is 100, how outdated will his brother be?
Reply: 99.
7. Use the numbers 2, 3, 4, and 5 and the symbols + and = to make a real math equation.
Reply: 2 + 5 = 3 + 4.
8. If 3 cats can catch 3 bunnies in 3 minutes, how lengthy will it take 100 cats to catch 100 bunnies?
Reply: 3 minutes.
9. Mr. Lee has 4 daughters. Every of his daughters has 1 brother. What number of kids does Mr. Lee have?
Reply: 5 (All the daughters have the identical brother.)
10. What single digit seems most often between and together with the numbers 1 and 1,000?
Reply: 1.
11. Which weighs extra: 16 ounces of feathers or a pound of strong gold?
Reply: They weigh the identical. 16 ounces = 1 pound, it doesn’t matter what materials is being weighed.
12. Jake purchased a pair of sneakers and a shirt, which price a complete of $150. The sneakers price $100 greater than the shirt. How a lot was every merchandise?
Reply: The sneakers price $125, the shirt $25.
13. You may have two cash that complete 30 cents. Considered one of them will not be a nickel. What are the 2 cash?
Reply: 1 / 4 and a nickel. (Solely ONE of the cash will not be a nickel!)
14. A + B + C = D, and A x B x C = D. What numbers make these two equations true?
Reply: A = 1, B = 2, C = 3, and D = 6.
15. Resolve this in your head (no writing it down!). Take 1,000 and add 40 to it. Add one other 1,000. Now add 30. Add one other 1,000. Now add 20. Add one other 1,000. Now add 10. What’s the complete?
Reply: 4,100.
16. Grandmother died and left half her cash to her granddaughter and half of that quantity to her grandson. She left a sixth to her brother, and the rest, $1,000, to the animal shelter. How a lot did she depart altogether?
Reply: $12,000.
17. Your sock drawer accommodates 18 white socks and 18 blue socks. With out wanting, what’s the smallest variety of socks you must take out to ensure an identical pair?
Reply: 3.
18. You planted sunflower seeds in your backyard. Day-after-day, the variety of flowers doubles. If it takes 52 days for the flowers to fill the backyard, what number of days wouldn’t it take for them to fill half the backyard?
Reply: 51.
19. There are 100 homes within the neighborhood the place Alex and Dev dwell. Alex’s home quantity is the reverse of Dev’s home quantity. The distinction between their home numbers ends with 2. What are their home numbers?
Reply: 19 and 91.
20. What are you able to place between 8 and 9 to make the end result higher than 8 however lower than 9?
Reply: A decimal (8.9 is bigger than 8 however lower than 9).
21. Multiply this quantity with another quantity and you’ll get the identical reply each time. What’s the quantity?
Reply: Zero.
22. If there are 6 oranges in a basket and you are taking out 4, what number of oranges do you’ve?
Reply: 4 (You took 4 oranges, so you’ve 4 oranges!)
23. There are 8 apples in a basket. Eight folks every take 1 apple, however there’s nonetheless 1 apple within the basket. How can this be?
Reply: The eighth individual took the basket with 1 apple nonetheless in it.
24. Multiply all of the numbers on the quantity pad of a telephone. What’s the complete?
Reply: Zero (Cellphone quantity pads embrace the numbers 0-9.)
25. There are 7 youngsters within the Garcia household, every born 2 years aside. If the eldest Garcia little one is nineteen, how outdated is the youngest Garcia little one?
Reply: 7.
26. Two moms and a couple of daughters every had 1 egg for breakfast, however they solely ate 3 eggs all collectively. How can this be?
Reply: There have been solely 3 folks—a grandmother, her daughter, and her granddaughter.
27. A 300-foot prepare touring 300 toes per minute should journey by means of a 300-foot-long tunnel. How lengthy will it take the prepare to journey by means of the tunnel?
Reply: 2 minutes. (It takes the entrance of the prepare 1 minute, and the remainder of the prepare will take 1 extra minute to clear the tunnel.)
28. I’m a three-digit quantity. My second digit is 4 occasions higher than the third digit. My first digit is three lower than my second digit. What quantity am I?
Reply: 141.
29. Tom was requested to color numbers outdoors 100 residences, which implies he should paint numbers 1 by means of 100. What number of occasions will he have to color the quantity 8?
Reply: 20 occasions (8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88 [two 8s], 89, 98).
30. Ellie works on the aquarium. When she tries to place every turtle in its personal tank, she has one turtle too many. But when she places two turtles per tank, she has one tank too many. What number of turtles and what number of tanks does Ellie have?
Reply: Ellie has 3 tanks and 4 turtles.
31. If eggs price 12 cents a dozen, what number of eggs are you able to get for $1?
Reply: 100 eggs (The eggs price 1 penny every.)
32. For those who toss a coin 100 occasions and it lands heads up each time, what’s the probability it should land heads up in your subsequent throw?
Reply: 50/50 (The earlier tosses don’t make any distinction; you all the time have an equal probability of heads or tails.)
33. You’re visiting a clothes retailer that has an odd means of pricing objects. A vest prices $20, socks price $25, a tie prices $15, and a shirt prices $30. You wish to purchase some underwear. How a lot will it price?
Reply: $45. Objects price $5 for every letter used to spell the phrase.
34. How will you make this equation appropriate: 81 x 9 = 801?
Reply: Flip it the wrong way up: 108 = 6 x 18.
35. You’re planning to spend your birthday cash taking some mates to the flicks. Is it cheaper to take 1 buddy to the flicks twice or 2 mates to the flicks on the similar time?
Reply: Take 2 mates on the similar time, so that you’ll solely purchase 3 tickets complete. For those who take 1 buddy twice, you’ll want to purchase your self a ticket every time, for a complete of 4 tickets.
36. Every day, a snail climbs 3 toes up a wall, however every evening it slips 2 toes again down whereas it sleeps. If the wall is 30 toes excessive, what number of days will it take for the snail to succeed in the highest?
Reply: 28 days. Every day, the snail makes a 1 foot achieve, bringing it to 27 toes by the twenty seventh day. On the twenty eighth day, it should climb the final 3 toes and attain the highest.
37. Divide 40 by half and add 10. What’s the outcome?
Reply: 90. The instruction says to divide by half, to not divide in half. In different phrases, the equation is 40 ÷ .5 = 80 + 10 = 90.
38. Add me to myself and multiply by 4. Divide me by 8 and you should have me as soon as extra. What quantity am I?
Reply: This works for any quantity!
39. Lin is 4 occasions as outdated as her daughter Rosa. In 20 years, Lin will probably be twice as outdated as her daughter. How outdated are Lin and Rosa now?
Reply: Lin is 40, and Rosa is 10.
40. A field holds 13 blue marbles, 13 pink marbles, and 13 inexperienced marbles. For those who’re unable to see into the field, what’s the minimal variety of marbles you want to take out to make sure you have one in all each shade?
Reply: 27. You may have to take out each one in all two colours of marbles (26) earlier than pulling one of many third shade (+1).
41. A retailer is providing a bat and ball for a complete of $1.10. The bat prices $1 greater than the ball. How a lot does every merchandise price individually?
Reply: The ball prices 5 cents, and the bat prices $1.05.
42. Discover two numbers whose squares add as much as 100. (Neither quantity is zero.)
Reply: 8 and 6 (64 + 36 = 100).
43. Miguel, Sara, and Olive share a field of 120 M&Ms. Miguel eats half the sweet, Sara eats one-third, and Olive eats one-tenth. What number of M&Ms are left?
Reply: 8. Miguel eats 60, Sara eats 40, and Olive eats 12. This leaves 8 items of sweet uneaten.
44. What is exclusive about this quantity: 8,549,176,320?
Reply: When spelled out as phrases, it accommodates the numbers 0 to 10 in alphabetical order. (Eight, 5, 4, and so on.)
45. Prepare the numbers 1 to 9 in a 3 x 3 grid such that the sum of every row, column, and diagonal is identical.
Reply: Row One: 8 3 4, Row Two: 1 5 9, Row Three: 6 7 2.
46. A rectangle has a fringe of 24 inches. If the size is twice the width, what are the size of the rectangle?
Reply: Width = 4 inches, size = 8 inches.
47. I’m a four-digit quantity (ABCD). Once you multiply me by 4, the reply is identical four-digit quantity in reverse (DCBA). What quantity am I?
Reply: 2,178.
48. What’s the subsequent quantity on this collection? 7,645 5,764 4,576 _______.
Reply: 6,457 (Transfer the ultimate digit to the start every time.)
49. A triangle has three angles which might be all sq. numbers. What are the angles of this triangle?
Reply: 16 levels, 64 levels, and 100 levels.
50. What’s the smallest complete quantity that, when written out in phrases, makes use of all of the vowels precisely as soon as?
Reply: 5 thousand.
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