“Subtract Tens from 3-digit Numbers” Quiz/Game
Subtracting a whole ten (like 20,40,70) from a 3-digit number is straightforward because the hundreds and ones places usually remain the same, or are only slightly adjusted by a regrouping (borrowing). The most important rule is to focus only on the Tens column first. Scroll down the page for a more detailed explanation.
 
This game gives you a subtraction problem that involves subtracting a whole ten from a 3-digit number. It may or may not require regrouping. It will also include a timer, a scoring system, and clear feedback to help you master this skill.
 

Subtracting Tens

Practice subtracting a whole ten from a 3-digit number.

Maximum Starting Number:

Enable 60-Second Timer

Start Game

Score: 0 / 0

Time: 60

Check Next

Back to Menu

 

How to Play the “Subtract Tens from 3-digit Numbers” Game
The game will show a gives you a subtraction problem that involves subtracting a whole ten from a 3-digit number. The subtraction may or may not require regrouping.
Here’s how to play:

1. Timed Option: Check the timer if you want to enable the 60 second timer. Click “Start Game”.
   
2. Look at the Problem: You will be given a subtraction problem that involves subtracting a whole ten from a 3-digit number. Find the difference.
   
3. Enter Your Answer: Enter the difference.
   
4. Check Your Work: Click the Check button (or press the Enter key). The game will tell you if you’re correct. If you are wrong, you will be shown the correct answer.
   
5. Get a New Problem: Click the Next button for a new problem.
   Your score is tracked at the top, showing how many you’ve gotten right out of the total you’ve tried.
   
6. Back to Menu Click “Back to Menu” to restart the game.
    
   

How to subtract a whole ten from a 3-digit number
Method 1: Mental Math (When No Regrouping is Needed)
This method is the fastest when the Tens digit in the 3-digit number is equal to or greater than the Tens digit you are subtracting.
Example: 583−30

1. Identify the Tens: Look at the Tens column in both numbers.
   583 has 8 tens.
   30 has 3 tens.
   
2. Ignore the Hundreds and Ones: The Hundreds digit (5) and the Ones digit (3) stay the same. You just need to subtract the tens: 8 tens −3 tens =5 tens.
   
3. Combine and Solve: The new Tens digit is 5.
   The answer is 553.
   So, 583−30=553
    
   

Method 2: Standard Algorithm (When Regrouping is Needed)
This method is necessary when the Tens digit in the 3-digit number is smaller than the Tens digit you are subtracting. You must “borrow” from the Hundreds place.

1. Set Up and Subtract the Ones: Write the numbers vertically.
   
2. Subtract the Tens and Regroup.
    
   

The key takeaway is that when you subtract a whole ten, the action is entirely in the Tens column, but sometimes that action forces a change in the Hundreds column (regrouping).
 

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