MULTIPLICATION OF NUMBERS : : SHORT-CUT METHODS
Multiplication tricks are required to calculate long and difficult multiplication problems. For single digit, 2-digit and even for 3-digit numbers, it is easy to do the multiplication. But for larger numbers which have more digits such as 4, 5, 6, 7,etc., it takes a long time to solve it. Therefore, we will learn here some magic maths tricks for fast calculation. These tricks can also be used to prepare for competitive exams.
In Maths, there is a number of arithmetic calculations or operations which includes multiplication and division, addition, subtraction, differentiation, integration, etc. Each calculation has its own method to calculate the relation between the numbers based upon the operation performed on them. Along with the methods, it is always useful to learn some multiplication tricks to save time.
What are Multiplicand and Multiplier?
It is necessary to know, what are the numbers called when we apply multiplication operation in them.
The multiplicand is the number which is being multiplied
The multiplier is the number which is multiplying the first number.
For example: In this operation, 45 × 20, 45 is the multiplicand and 20 is the multiplier.
How to Multiply Fast?
Here are some tips and tricks with the help of which, you can easily solve multiplication problems. These tricks you can use in competitive exams as well. Students can by-heart multiplication tables to calculate fats. Let check the multiplication tricks for different numbers.
Multiplication by 2: It denotes to double a number.
For example; 5 × 2, here we have to double the number 5, so we can use addition method here, i.e.
5 + 5 = 10
Multiplication by 3: It denotes triple times of a number.
Example: 5 × 3 = 5 + 5 + 5 = 15
Multiplication by 4: It denotes double of a double number.
Example: 5 × 4: double of 5 is 10. Thus double of 10 is 20(10+10)
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 8: Double → Again Double → Again Double
Example: 5 × 8: 5 + 5 = 10; 10 + 10 = 20; 20 + 20 = 40
Multiplication by 9: Add +1 to 9 and minus the number with itself, which is to be multiplied.
Example: 5 × 9: 9+1 × 5-5 = 10 × 5 – 5 = 50 -5 = 45
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