Multiplication by 4: It denotes double of a double number. Multiplication by 5: If a number is multiplied by 5, then divide the number by 2 and multiply by 10. Example: 8 × 5: 8 divide by 2 = 4, multiply 4 by 10, 4 × 10 = 40. Multiplication by 9: Add +1 to 9 and minus the number with itself, which is to be multiplied.
Multiplication is when you take one number and add it together a number of times. Example: 5 multiplied by 4 = 5 + 5 + 5 + 5 = 20. We took the number 5 and added it together 4 times. This is why multiplication is sometimes called “times”.
A Mathemagical Trick
Start by thinking of a number, any number. Now, multiply that number by 9. If the result is a multi-digit number, add its digits together to come up with a new number. If that new number is still a multi-digit number, add its digits together to come up with yet another new number.
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|5.||Death of the Father of Mathematics|
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