The Ruler Game: Learn To Read a Metric Ruler

Instructions:

• Use this game to learn and practice your ability to read a metric ruler.
• This game can be played using either 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 displayed randomly in either millimeters (mm) or 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

• For every 10 correct measurements, you will advance to the next level. Your current level is displayed in the Results Bar below the ruler image.
• The timer is displayed to the right of the score in the Results Bar. As time passes, the bar shortens. It begins green, turns yellow, and finally turns red when only a few seconds remain.
• If you have not selected a measurement before the time runs out, you will receive a strike for selecting 0.
• For each incorrect answer, you will receive a strike. After three strikes, your game is over. The number of strikes you have received is displayed 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 answer.
  • Sounds: The default setting is On. Select Off to mute all game sounds.
  • Ruler Length: The default setting is 4 cm. You can select any length from 1 cm to 12 cm. Selecting the Automatic setting adjusts the ruler length to always fit your browser window. Note: If you select a length that exceeds 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 whether the questions are in centimeters, millimeters, or both. The default setting is both.
  • Mode: The default mode is "Find". You can also select "Type". In Type mode, numbers appear below the ruler, and you can enter the correct answer by either clicking these numbers or using your keyboard. Once you've entered your answer, click "Submit Answer." Note: In "Type" mode, the starting time is 20 seconds, and decreases by 2 seconds after every 10 correct answers.
  • The current settings are always displayed in the lower-left corner of the ruler image.
  • Settings are saved in your browser for the duration of your session.