Knock Down Subtraction

Subtraction Knock Down - Subtraction Math Game

Content Skill: Subtraction          
Common Core State Standards: CCSS.Math.Content.2.OA.B.2 - Fluently subtract within 20 using mental strategies.  By end of Grade 2, know from memory all sums of two one-digit numbers.


If you like Angry Birds, you will love Subtraction Knock Down.  In this game, you sling pellets at boxes, trying to knock all the boxes off the platforms.  As you progress through the levels, the boxes and the platforms change and become more difficult.

Before you get to shoot a pellet at the box, you will answer a subtraction fact.  If you are logged into the student management system, the equations you answer will be based on the subtraction facts you are currently working on.  The subtraction equations presented are not random.  Our probability engine chooses subtraction fact based difficulty and your progress.  This Angry Bird style game is a challenging yet fun way to practice and learn the subtraction facts.


Subtraction Knock Down IntroductionWelcome to Subtraction Knock Down.  At the opening screen, choose PLAY to begin playing the game.  Select “How to Play” for the game directions.
Subtraction Knock Down How to PlayThere are 18 unique and interesting levels.  The object of the game is to knock down all the boxes with the pellet-bow and balls.  When all the boxes fall down, the level will be complete.  In each level there are a certain number of balls and limited time.  If you run out of balls or time, the level will fail.  Each level score depends on how many balls are left and how much time is left.  To throw the ball, press the mouse button and hold near the pellet-bow, then more the ball, aim and then release.
Subtraction Knock Down LevelsThere are 18 levels to the game.  As you pass each level by knocking down all of the boxes, another level will be unlocked.
Subtraction Knock Down ScreenAt the top left is the level you are on.  You can also restart the level or end the level at the top left of the screen.  The top right displays the time you have left.  Sound Effects can be turned off by clicking the Sound Effects Icon. The music can be turned off by clicking the Music Icon.
Subtraction Knock Down Game PlayTo fling the pellet at the boxes, place you cursor over the pellet and hold down on the mouse button.  Without releasing, move the mouse cursor to the left and down, the pellet will be pulled back.  To fling the pellet, release the mouse button.  The pellet will follow the trajectory you set.
Subtraction Knock Down Hitting BoxesIf you sling the pellets at the right trajectory, they will knock down the boxes.  To pass the level, knock all of the boxes off all of the platforms.  The pellet uses motion physics to travel, bounce, and hit the boxes in a realistic manner.
Subtraction Knock Down - Subtraction EquationsAfter you sling your first pellet, you will need to answer a subtraction fact to get you next pellet.  Just click on the correct answer.  If you don’t remember the answer and are logged into our student management system, you can get a hint by clicking on the equation above the game.  You can also watch an animated teaching video by clicking on the picture hint. 
Subtraction Knock Down - Level FailedIf you don’t knock all of the boxes off the platform or you run out of time during the level, you will not pass the level.  No worries, just try again.  Click on Restart level.
Subtraction Knock Down - Level PassesWhen you knock all of the boxes off the platform in the allotted time, you will pass the level.  You have a choice of playing the level again to increase your score on the level  (Restart Level),  or you can choose to go to the next level (Next Level).  You can also choose to replay any level you have already passed (Select Level) or return to the starting menu (Main Menu).
Subtraction Knock Down makes learning the subtraction facts fun!