Decimal Addition Game

Decimal Addition Game
This game is designed to test your ability to organize the decimals by place value before performing addition. Scroll down the page for a more detailed explanation.
 

 

How to Play the Decimal Addition Game

1. The Goal
   You are given two decimal numbers with different lengths. You must move them until their decimal points (the red dots) are in the exact same vertical column, then calculate their sum.
   

2. Step-by-Step Instructions
   Step 1: Align the Decimal Points
   When the game starts, the numbers are usually “scrambled” horizontally.
   Use the Shift Left and Shift Right buttons for Row 1 and Row 2.
   Move the rows until the red cells are perfectly stacked on top of each other.
   Try to also align with the decimal point in the sum.
   Once they are aligned, the status message will turn green and say: “ALIGNED! Enter the sum."
   

Step 2: Solve the Sum
Now that the numbers are aligned, the Sum input boxes will appear at the bottom.
Add the numbers column by column, starting from the right (the smallest decimal place) and moving to the left.
Pro Tip: If one number is shorter than the other, imagine a placeholder zero in the empty space to help you add.

Step 3: Check and Score
Click Check Answer.
Green boxes: Your digit is correct.
Red boxes: Something is wrong. Re-add that column.
The Zero Rule: If the last digit of the answer is a 0, the game allows you to leave that box empty (e.g., 12.50 can be entered as 12.5).

3. Understanding Your Score
   The score in the top right tracks your progress Correct/Attempted:
   Correct: This goes up only when you solve the entire problem perfectly.
   Attempted: This goes up the first time you click “Check Answer” for a new problem.
    
   

The video gives a clear, step-by-step approach to learn decimal additions.

• Show Video

 

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