26 June 2016

394. Mathematical: 5 minus 2 is not 8

Easy Medium Hard Extreme


Move 2 matchsticks to make the statement true. Consider yourself very good if you can solve it within 30 seconds!

25 June 2016

393. Rectangle 4X2: Remove 4 to create 5 squares

Easy Medium Hard Extreme


Take away 4 matchsticks to create 5 squares. The squares must all be equal in size.

Show Answer

There are also other variations of this solution.

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24 June 2016

392. Vertical Symmetry

Easy Medium Hard Extreme


Three shapes are cut from a piece of cardboard and placed as shown above to form a combined shape. If the matchsticks on the inside of the shape are ignored, you will note that the combined shape is not symmetrical along any vertical axis.

However, a combined shape with vertical symmetry (again ignoring the inside matchsticks) can be created by flipping and/or rotating one of the shapes. Show how you would do this by moving only 3 matchsticks to create a combined shape that is vertically symmetrical.

Show Answer

The piece of cardboard in the middle is flipped vertically and then rotated 90 degrees clockwise.

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22 June 2016

391. Square 3X3: Move 5 to create 4 squares

Easy Medium Hard Extreme


Move 5 matchsticks to create 4 squares. In your solution there must be:

- at least 2 squares of size 3X3
- at least 1 square of size 2X2
- at least 1 square of size 1X1

Show Answer

- The 2 squares of size 3X3 are AIKF and BJLG
- The 2X2 square is CEHF
- The 1X1 square is ABDC

Below is the suggested way of constructing the solution above:

1. Place 3x3 squares overlapping, since only 5 can be moved, it has to come from the internals of the 3x3 squares.
2. Leave a 2x2 square within the original.
3. In order for the 3x3 to overlap, there has to be a line cutting the 2x2 into 1/2s.

There are also other variations of this solution.

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20 June 2016

390. Transparent 98

Easy Medium Hard Extreme



You have printed 2 digital numbers on 2 different sheets of transparency film. When sheet 1 is placed exactly on top of sheet 2 (or vice versa) it shows the digital number 98 as illustrated above. You then discover that the number on sheet 1 plus the number on sheet 2 is also equal to 98. What are the 2 digital numbers printed on the 2 sheets?

19 June 2016

389. The 5 smaller farms

Easy Medium Hard Extreme



Divide the above farm into 5 smaller farms by adding 11 matchsticks. The 5 farms must be equal in size and shape.

Show Answer

There are also other solutions.

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18 June 2016

388. Snake to 2 squares

Easy Medium Hard Extreme


Move only 2 matchsticks to convert the snake into 2 squares.

17 June 2016

387. Series of matchsticks

Easy Medium Hard Extreme


Try to work out the logic behind this series of 7 matchstick shapes and replace the question mark.

Show Answer

The row consists of the lower matchsticks of the numbers 1 to 7 and number 8 is the next one to replace the "?".

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16 June 2016

386. Reduce the area to 6 square units

Easy Medium Hard Extreme


If the length of 1 matchstick is 1 unit, the area of the shape above is 9 square units. Move 6 matchsticks to change the area to 6 square units.

Show Answer

There are also other variations of this solution.

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12 June 2016

385. Matchstick somersault

Easy Medium Hard Extreme


An amazing little stunt with matchsticks! It is very important to build the structure EXACTLY as shown above and on flat and hard surface.

Without touching matchstick A, how can you make matchstick A do a somersault (or a flip) in the air?!!

Show Answer

Tap down quick and hard with your finger on the circled area and see what happens. You might not get it right the first time, but just try again!

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11 June 2016

384. Move 2 to create 6 triangles

Easy Medium Hard Extreme


There are 6 triangles in the figure above. All the triangles are equal in size.

Move 2 matchsticks to still have 6 triangles, but now all the triangles don't have to be equal in size.

10 June 2016

383. Roman Numerals: 6 minus 4 is not 9

Easy Medium Hard Extreme



Move only 1 matchstick to make the equation true.

05 June 2016

382. Divide into 6 shapes

Easy Medium Hard Extreme


Add matchsticks to divide the layout above into 6 shapes. The shapes must be equal in size and shape. Each shape must contain 2 broken matchsticks. The broken matchsticks may not be moved.

04 June 2016

381. Move 6 to drive a Mitshubishi

Easy Medium Hard Extreme


MOVE 6 matchsticks to form 3 rhombuses. (Also known as diamonds)

Show Answer

The 3 diamonds above is similar to the logo of Mitshubishi Motors.

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03 June 2016

380. Big and small square

Easy Medium Hard Extreme


The small square is exactly in the middle of the big square. Move 4 matchsticks to create 3 squares. All squares don't have to be equal in size.

02 June 2016

379. Rhombus and square

Easy Medium Hard Extreme


Shown above is a rhombus (also known as a diamond) and a square. The distance between A and B is exactly the length of one matchstick. Move 3 matchsticks to create:
- a square
- a rhombus
- 2 equilateral triangles.

29 May 2016

378. Garden spade and fork

Easy Medium Hard Extreme



Figure 1 above shows a garden spade and fork. In Figure 2 the two garden tools are placed next to each other.

The challenge is to swap positions in Figure 2 by moving only 4 matchsticks. In your solution the spade must still point downwards and the fork still upwards.

28 May 2016

377. Triangle 3X3: Remove 6 leaving 3 rhombuses

Easy Medium Hard Extreme


Remove 6 matchsticks to leave only 3 rhombuses. (also known as diamonds)

27 May 2016

376. Missing triangles in a row

Easy Medium Hard Extreme


The triangles form a sequence from 1 to 3. What should the structure look like in position 4?

Show Answer

Triangles A and B remain in the same position. Triangle C moves clockwise rotating itself around the corner of the next triangle as indicated. The broken matchstick remains unchanged within triangle C and moves along as triangle C rotates.

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22 May 2016

375. Cocktail to house

Easy Medium Hard Extreme


Shown above are 2 cocktail glasses. The distance between A and B is exactly the length of 1 matchstick. Move 6 matchsticks to change the cocktail glasses into a house.

21 May 2016

374. Pentomino shapes in a row

Easy Medium Hard Extreme


Each pentomino shape above is placed on a specific position within the row. Can you figure out what it represents?

Show Answer

If you turn your head 45 degrees to the left you will see it represents the last 4 letters of the alphabet - W X Y Z.

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20 May 2016

373. Move 4 to create 6 squares

Easy Medium Hard Extreme


There are 4 squares in the figure above. Move 4 matchsticks to create 6 squares. All the squares don't have to be equal in size and don't have to be flat on the surface.

15 May 2016

372. Create 4 triangles

Easy Medium Hard Extreme


You would have to think out of the box with this one!

Move 1 matchstick to show there are 4 triangles.

14 May 2016

371. Mathematical: 7 plus 1 is not 0

Easy Medium Hard Extreme


It is true that 7 - 7 = 0 by moving 1 matchstick. However, the challenge here is to move 2 matchsticks to make the equation true.

10 May 2016

370. Remove 4 to create 5 squares

Easy Medium Hard Extreme


Remove 4 matchsticks to create 5 squares. The squares don't have to be equal in size.

Show Answer

1X1 squares:
ABFE
BCGF

2X2 squares:
DFLN
EGKM
FHJL

Hide Answer