The Ruler Game: Learn To Read a Metric Ruler

Instructions:

• Use this game to learn and improve how you read a metric ruler.
• This game can be played using a mouse or a touchscreen.
• Press the Play Game button to begin playing the game.
• A measurement to select will appear above the ruler image.
• Questions are randomly displayed either in millimeters (mm) or in centimeters (cm).
• Move your mouse (or slide your finger on a touchscreen device) over the ruler image until the green bar reaches the mark for the displayed measurement. To check your answer, click on the ruler (or lift your finger on a touchscreen device).
• For each correct answer, you will be awarded points. Your score is displayed on the left side of the Results Bar that appears below the ruler.
• Points are awarded based on the following table.

  Level	Time Limit	Points
  1	10 seconds	10
  2	9 seconds	20
  3	8 seconds	30
  4	7 seconds	40
  5	6 seconds	50
  6	5 seconds	60
  7	4 seconds	70
  8	3 seconds	80
  9	2 seconds	90
  10	1 second	100

• Each time you correctly guess 10 measurements, you will advance to the next level. Your current level is indicated in the Results Bar below the ruler image.
• The timer is represented to the right of the score in the Results Bar. As time passes, the bar will get shorter. It will begin as green, then turn yellow when you have only 5 seconds remaining, and turn red when you have only 2 seconds remaining.
• If you have not selected a measurement when the time runs out, you will receive a strike for selecting 0cm.
• For each incorrect answer, you will receive a strike. After three strikes, your game is over. The number of strikes you have received is indicated on the right side of the Results Bar below the ruler image.
• Click the Settings button to adjust your preferences for the game.
  • Timer: The default setting is On. Select Off to have unlimited time to make your guess.
  • Sounds: The default setting is On. Select Off to disable all game sounds.
  • Ruler Length: The default setting is 4cm. You can select any length from 1cm to 12cm. Selecting the Automatic setting will cause the length of the ruler to always fit your browser window. Note: If you select a length that will make the ruler longer than the width of your browser window, it will be automatically adjusted to the longest length that will fit on your screen.
  • Questions: You can choose if the questions are in centimeters, millimeters or both. The default is both.
  • The current settings are always displayed in the lower left-hand corner of the ruler image.
  • Settings are saved in a cookie in your browser, so the next time you play The Ruler Game, your last settings will be restored.