The 10 multiplication rule is a simple shortcut for multiplying any whole number by 10. As described in our reference material, when you multiply a whole number by 10, you simply add a 0 to the end of the number.
How the 10 Multiplication Rule Works:
-
Basic Concept: Multiplying by 10 increases the place value of each digit in a number by one, effectively shifting each digit one position to the left and placing a zero in the ones place.
-
Rule: Add a '0' to the right of the whole number.
Examples of the 10 Multiplication Rule:
| Number | Multiplication | Answer |
|---|---|---|
| 5 | 5 * 10 | 50 |
| 3 | 3 * 10 | 30 |
| 12 | 12 * 10 | 120 |
| 125 | 125 * 10 | 1250 |
| 100 | 100 * 10 | 1000 |
Practical Insights:
- This rule makes mental math involving 10 very easy.
- It is also very useful in real-world applications, for example, if a product costs $7 each and you need to purchase 10, then the total cost is quickly calculated by adding a zero at the end, which is $70.
Solutions:
Using the 10 multiplication rule, you can quickly solve any multiplication problem involving 10:
- Problem: What is 27 multiplied by 10?
- Solution: 270 (simply add a 0 to the end of 27)
- Problem: What is 99 multiplied by 10?
- Solution: 990 (simply add a 0 to the end of 99)
This simple rule provides an efficient method for multiplying numbers by 10 and forms a foundation for understanding place value and the decimal system.
