Create A Puzzle School Account
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Instructions
A quick overview
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Complete the puzzle by directing the right amount of laser in to the lightbulbs to turn them yellow.
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If the lightbulb turns blue there is too little laser, if it turns red there is too much laser.
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Drag pieces on to the board from the right hand sidebar to manipulate the laser.
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Click on a piece to learn more about what it does.
The Goal
Direct the correct fraction of laser in to each lightbulb in order to light it up yellow.
The lightbulb will turn blue if it has too little laser. If it turns red, it has too much laser.
Options
Drag pieces from the right hand area on to the board to complete the puzzle.
Pieces
Click on a piece to read more about what it does.
Get Started
So try to solve each puzzle using the pieces available to make all of the lightbulbs light up yellow.
You'll master fractions before you know it!
Select A Level
- Basics
- Multiple Pieces
- Adding Fractions
- Complex Situations
You can also try creating your own level in the Level Editor. Just click on an empty square on the board to select a piece of your puzzle to place there.
The Laser 
The laser shoots a laser of a given fraction that can be used to light up the sensors.
The fraction that a given laser shoots is displayed on the laser, in this case the fraction is 1/2.
The Sensor 
The sensor will light up when a laser is directed in to the base of the sensor.
You need to make all sensors light up yellow to solve each puzzle.
The Blue Sensor
The sensor will turn blue if there is not enough laser being directed in to it.
In this example 1/4 is less than 1/3, so the sensor isn't getting enough laser and has turned blue.
The Yellow Sensor
The sensor will turn yellow if just the right amount of laser is being directed in to it.
In this example 1/4 is equal to 1/4, so the sensor lights up yellow.
The Red Sensor
The sensor will turn red when there is too enough laser being directed in to it.
In this example 1/4 is greater than 1/5, so the sensor is getting too much laser and has turned red.
The Splitter 
The splitter will split your laser in to two lasers or three lasers.
When a splitter splits a laser, it divides that laser by two or three.
So a two-way splitter will take a 1/3 laser and produce two 1/6 lasers.
A three-way splitter will take a 1/4 laser and produce three 1/12 lasers.
1/3 ÷ 2 = 1/6 and 1/4 ÷ 3 = 1/12
The Turner 
The turner will redirect a laser in a new direction.
It won't change the value of the fraction on the laser at all.
The Adder 
The adder allows you to add together two lasers that have fractions with a common denominator.
The denominator is that number of the bottom of the fraction.
The numerator is the number on the top of the fraction.
In order to add fractions you must find a common denominator and then you simply add together the numerators.
So in order to add 1/4 + 1/8 you must convert 1/4 to 2/8 and then you can add 2/8 to 1/8 to get 3/8.
If you try adding fractions without a common denominator, the adder will not produce any laser.
Change The Denominator 
This piece allows you to change the denominator of a laser's fraction, doubling it or tripling it.
When you change the denominator of a fraction you must also change the numerator that the overall value remains the same.
So if you have 1/4 and you double the denominator then you must also double the numerator, getting 2/8.
1/4 is the same as 2/8 which also equals 3/12.
In fact 1/4 = 2/8 = 3/12 = 4/16 = 5/20, etc. All of these are the same value, just with different denominators.
