Multiply by 2 by Whole Tens Quiz/Game
You can multiply 2 by a whole ten (a number like 10, 20, 30, etc.) by using a simple two-step mental math strategy. This method works because of the associative property of multiplication, which allows you to group factors in different ways. Scroll down the page for a more detailed explanation.
 
This game gives you a multiplication problem where the multiplier is a 2 and the multiplicand is a whole tens, for example 90 × 2. You can set the maximum multiplicand to adjust the difficulty. It will also include a timer, a scoring system, and clear feedback to help you master this skill.
 

Multiply 2 by Whole Tens

Practice multiplying 2 by multiples of 10.

Maximum Multiplicand:

Enable 60-Second Timer

Start Game

Score: 0 / 0

Time: 60

Check Next

Back to Menu

 

How to Play the Multiply by 2 by Whole Tens Game
The game will show a multiplication problem where the multiplier is a 2 and the multiplicand is a whole tens.
Here’s how to play:

1. Maximum Multiplicand: You can set the maximum multiplicand up to 990.
   
2. Timed Option: Check the timer if you want to enable the 60 second timer. Click “Start Game”.
   
3. Look at the Problem: You will be given a multiplication problem where the multiplier is a 2 and the multiplicand is a whole tens. Find the product.
   
4. Enter Your Answer: Enter the product.
   
5. 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.
   
6. 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.
   
7. Back to Menu Click “Back to Menu” to restart the game.
    
   

How to multiply 2 by whole tens using mental math
The two-step mental math strategy

1. Multiply the non-zero digits.
   First, ignore the zero in the whole ten and multiply the single-digit numbers. For example, if you are multiplying by 20, you would first multiply by 2.
   
2. Add a zero to your answer.
   Because you initially ignored the zero from the whole ten, you must now add it back to the product to shift its place value correctly
    
   To calculate 2 × 80:
   Multiply the non-zero digits: 2 × 8=16.
   Add a zero: Add the zero from 80 to get 160.
   So, 2 × 80=160
    
   

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