Brain teasers and logic riddles play an important role especially in the mental development of high-school children. Let’s have a look at some of the best riddles with answers we’ve compiled for you and your kids:

1

How many circles contain the black dots?

12 circles

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2

What is our weight?

Dog=17 kg, cat and rabbit= 10 kg. The answer is 27 kg.

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3

Can you solve the equation?

The answer is 1.

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4

Move just 2 matchsticks to make the equation correct!

9-9=0. Move one from the addition sign to make it a subtraction sign, and put it to 3 to make 9, 2. move one from 8 to make it 9.

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5

Can you find the missing number?

The answer is 3.

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6

Can you move four matchsticks to form three squares?

Children need to solve different brain teasers and logic riddles based on their age and educational level. If you give a middle-school child extremely hard or impossible math riddles to solve, this may undermine his self-confidence. We have listed the math and logic riddles that are suitable for your child according to the grades:

1

Each ball has the value shown in the boxes below. Write the total of each horizon and vertical line of balls!

2

There are 5 bags with 1,2,3,4,5 balls inside and two sizes of boxes. Put the bags into the boxes in a way that the big box has twice the number of balls than the smaller box. Find out all of the 3 ways to do so!

1

Mark all 3 numbers that stand horizontally or vertically next to each other and make 10 when you add them.

2

How many triangles can you count in this shape?

There are 13 triangles!

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1

How would you place the numbers 10, 20, 30, 40, 50, 60, 70 and 80 so that each side of the square adds up to 150?

2

How would you place the numbers 2, 4, 6, 8, 10, 12 and 16 so that the numbers in the hexagon are equal to the two numbers in the circles added together on either side.

There are 8 total possible solutions. 2 of the solutions are as below. The other 6 solutions are simply the rotated versions of those two.

1

How would you place the numbers from 1 to 6 to get the product?

2

Each number in the hexagons is the sum of the two numbers below it. So what should be placed in the top hexagons?

81 and 420

1

Here is a magic square in which each line of 3 numbers adds up to the same amount vertically, horizontally or diagonally. The total must be 7½. How will you place the numbers 0, ½, 1, 1½, 2, 2½, 3, 3½, 4, 4½?

2

Start the maze with 0 and finish it with a total of 10. You can move to the right or down each turn. Find 3 different ways to do so!

1

If the same proportion holds, what is the value of 1/3 of 10?

2

A merchant can place 8 large boxes or 10 small boxes into a carton for shipping. In one shipment, he sent a total of 96 boxes. If there are more large boxes than small boxes, how many cartons did he ship?

7 large boxes (7 x 8 = 56 boxes)

4 small boxes (4 x 10 = 40 boxes)

So the answer is **11 total cartons** for 96 boxes

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1

Can you find the missing number?

The answer will be 2. Look at how many closed areas there are.

9999 has 4 closed areas (the top of the '9').

8888 has 8 closed areas (the top and bottom parts of 8 and there are no other digits).

1816 has 3 closed areas (top and bottom of 8 and bottom of 6, and it has 2 other digits (3 * 2 = 6)).

1212 has 0 closed areas, (0 * 4 = 0).

2

How can you add eight 8's to get the number 1,000? (only use addition).

The key to this math riddle is realizing that one place must be zero. 888 + 88 + 8 + 8 + 8 = 1,000

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1

A 35-year-old woman has 3 children. If you multiply the 3 children's ages, you get 36. If you add up the children's ages it's 13. And her oldest child plays basketball for 3 years.

How old are the kids?

They are 2, 2, and 9.

If you list out the trio of factors that multiply to 36, you get:

1 1 36 = 38

1 2 18 = 21

1 3 12 = 16

1 4 9 = 14

6 6 1 = 13

2 2 9 = 13

2 3 6 = 11

3 3 4 = 10

If the sum is 13, as you can see, there are 2 options. When she says her 'oldest' you know it cannot be {6, 6, 1} since she would have two 'older' sons, not an 'oldest'.

2

An athlete is jumping. However, every time she jumps she gets a bit more tired, and every jump goes 1/2 as far as her prior jump. Now, for her very first jump, she goes 1/2 of a foot. On her second jump, she goes 1/4 of a foot, and so on and so forth. How many jumps does it take for her to travel 1 foot?

She will never get to the 1-foot mark because you keep adding smaller and smaller amounts!

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Solving puzzles is one of the best-known ways to keep your mind fresh. Since math puzzles and logic riddles make our brain muscles work, these are the exercises that adults generally prefer. Check out the best examples we have listed below for adults:

1

Can you solve the equation?

The answer is 252,

A⁴= 2⁴-2, B⁴=3⁴-3 so following the same pattern C⁴=4⁴-4=252.

2

Can you find the missing number?

The number that should replace the question mark is 9. Why? The sum of the three numbers on each die equals the number written below it. For the first die, for example: 8 + 4 + 7 = 19; for the second: 8 + 2 + 1 = 11. Following this pattern would explain why the third die is also 11 (5 + 5 + 1) and why the mysterious question mark should be 9 (4 + 3 + 2).

3

Move the numbers from the outer frame onto the board so they snake together vertically, horizontally, or diagonally in sequence from 1 to 25. (For example, 2 must touch both 1 and 3.) The catch: You can only move a number in the direction indicated on its home square. Each number fits in its own cell.

4

A whole number between one and seven belongs in each of the seven bubbles. Each number occurs once. The sums of some of the numbers are revealed in the areas where their bubbles overlap.

Can you figure out which number goes in each bubble?

5

Which glass will be filled first?

3

Because of the glasses, 5, 6 and 7 got a blocked connection. Now, since the connection to 3 is lower than that of 2, it will fill first while the remaining glasses will remain empty.

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6

How many squares are there in a chessboard?

The answer is 204🙋

Challenge is always good for our brains but there are really impossible math riddles that are just designed for geniuses! Here are some great examples of hard but not impossible ones for you:

1

Can you solve the equation?

Consider, number as: A + B + C

Now they are following this pattern: A + B + C = [AxB] [AxC] [(AxB)+(AxC)-(B)]

Where: [AxB] = First two digits

[AxC] = Further two digits [(AxB)+(AxC)-(B)] = Last two digits

E.g.: 5 + 3 + 2 =

First two digits: 5×3= 15

Further two digits: 5×2= 10

Last two Digits: 15 + 10 = 25 – 3(middle number from question) = 22

So, we get 5 + 3 + 2 = 151022

Same as: 7 + 2 + 5 = 143547

2

You are running a race with three persons. You overtake the secondlast person, what position are you in NOW?

If your reply is the 2nd position, then you are just trapped in this puzzle trick just like many. The correct answer is the 3rd Position. You are running a race with three persons, that means the total number of people running in this race is four, and you passed the second-last person (i.e. The Third-person). Now you are in the third position.

3

Can you find the value of the missing number?

The Answer is 14.

The outer number is the sum of the numbers in the two segments immediately across the line connecting big Circle to small Circle.

4

Can you find the number?

The second digit is not important for the result.

Result =

first digit * first digit

third digit * third digit

398 = 964 (3*3 8*8)

118 = 164 (1*1 8*8)

356 = 936 (3*3 6*6)

423 = 169 (4*4 3*3)

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5

How can you make the following equation true by drawing only one straight line:

Draw a line on the first plus sign. This turns it into a 4! The equation then becomes correct: 545+5=550.

6

All the math nerds! Here is a good challenge for you.

A = 6. B = 10. C = 18. D = 33

If you don’t find the answer, don’t worry. MentalUP has more challenging math riddles for you **I Want to Try MentalUP!**

When it comes to riddles, the sky's the limit! You can even find Christmas, Thanksgiving or Halloween math riddles, as well as some really tricky and fun ones. Below we have listed the most unusual and fun ones for you:

1

How do you make the number 7 an even number without addition, subtraction, multiplication, or division?

Drop the "S".

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2

It’s confusing but you can find the answer if you think differently.

F I V E

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

3

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?

3 tickets (the grandmother is also a mother and the mother is also a daughter)

4

If the tree grew by five centimeters each year, how much higher would the nail be?

The nail would be at the same height since trees grow at their tops.

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5

How many sides does a circle have?

Two. The inside and the outside.

6

What does one math book usually say to the other math book?

“Do you want to hear my problems?”

Solving math teasers is always fun, no matter your age. Make sure to try the **MentalUP Educational Brain Teasers App** to see all of the cool math riddles, other riddles on other subjects and challenge the limits of your brain to become even more successful in life!