Question

short tricks for multiply ​

Answer 1

Answer:

Multiplication Short Tricks for a 2-digit numbers

68 × 2. Rounding the number 68 to 70, 70×2=140. Multiplying the rounded amount to itself; 2×2=4. Subtracting 140-4= 136.

28 × 22. If we right, 22 as 20+2 and then multiplying them separately, 28×20 and 28×2 and adding them. 28 28. ×20 + ×2. —— —— 560 + 56 = 616. —— ——

Step-by-step explanation:

Multiplication Short Tricks: How to Multiply Numbers Fast?

Let’s now have a look at some of the multiplication short tricks and tips through which you can easily solve complex multiplication sums. These multiplication short tricks can be used in competitive exams to solve multiplication problems easily. 

Multiplication by 2

It refers to doubling a number.

Example: 6 × 2, here we have to double the number 6.

So we can apply the addition method here, i.e.

6 + 6 = 12

Multiplication by 3

 It refers to tripling a number

Example: 6 × 3 = 6 + 6 +6 = 18

Multiplication by 4

It denotes a double of a double number.

Example: 6 × 4: double of 6 is 12.

Thus, double of 12 is 24 

Multiplication by 5

When a number is being multiplied by 5, then you may also divide the number by 2 and then multiply by 10.

Example: 6 × 5 will be the same as:

6 divide by 2 = 3, multiply 3 by 10, 3 × 10 = 30

Multiplication by 8

It involves: Double → Again Double → Again Double

Example: 6 × 8 will be:

 6 + 6 = 12; 12 + 12 = 24; 24 + 24 = 48

Multiplication by 9

When a number is being multiplied by 9, add +1 to 9, then subtract the multiplier with itself

Example: 5 × 9 = 9+1 × 5 – 5 = 10 × 5 – 5 = 50 -5 = 45