Children's House of 
-Math
If You Are 9-12 years old; and You Love MATH ... This Page is for you! You will have fun. While you learn with me the most amazing FUN Shortcuts OF MATH.
"Growing Old is Mandatory.... But ... Growing up is Optional!"
Multiplying any 2 digits number that ends with 5 by itself
(This page is courtesy of Mr. Georges Awad (my brother in law)
The process could be divided into the following simple 4 steps:
- Focus on the left digits of each of the two numbers
- Add 1 to one of them
- Multiply them by each other
- Add 25 to the right of the numbers obtained above ... ET Voila!
Example:
Multiply 75 By 75:
Focus on the left digits of each of the two numbers: 7 & 7
Add 1 to one of them: 7 & 8
Multiply them by each other: 7X8=56
Add 25 to the right of the numbers obtained above: 5625 et Voila !!
Another Example:
Multiply 45 by 45:
- Focus on the left digits of each of the two numbers: 4 & 4
- Add 1 to one of them: 4 & 5
- Multiply them by each other: 4X5=20
- Add 25 to the right of the numbers obtained above: 2025 et Voila !!
Other Cool-Math Topics
-
Multiplication of any 2 digits number by 11
- Helping Your Child at Home to explore Numbers & Fractions
- Multiplication of any 3,4,5, ....etc digits number by 11
- Vertical Multiplication
- Verify your Multiplication's
- Multiplying any Number (one digit) by 9
- Multiplying any 2 digits number that ends with 5 by itself
- Can a number be divided by 2, 3, 4, 5, 9 or 10
- Units Conversion
- Definition & Understanding of Decimal
- Multiplication and division of a decimal by 10,100, 1000, .....etc
- Multiplication of decimal numbers by each others
- Division of decimal numbers by each others
- Signs, Definition, Adding, Multiplying & Dividing numbers with signs
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Children's House of -Math
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I will see you tomorrow with another shortcut ... Have a nice evening. And do not forget to do your Homework!
Yahooligans!
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