Shortcut-4

Subtraction Shortcut

Let’s take an example:

120 – 97

Step – 1:

It’s little bit confusing to subtract by “97”.

So, subtract by “100”.

We would get:

120 – 100 = 20

Step- 2:

What’s difference of “97” from “100”?

100-97=”3”

Step – 3:

Simply add “3” to “20”:

Hence the answer is:

“23”

Let’s take more examples:

1581 – 89

Step – 1:

Subtract from “100”

We would get:

1581-100 =

“1481”

Step -2:

Difference of “89” from “100” is:

100 – 89 = 11

Step – 3:

Add “11” to 581”:

1481 + 11

= 1492

1581 – 109

Please note here second number is greater than “100”

Step- 1:

Subtract “1581” from “100”

We would get:

“1481”

Step – 2:

Subtract further by “9”

1481 – 9

= 1472

Let’s take one last example:

1581 – 1339

Step-1:

Subtract from “1000”

We would get:

1581 – 1000 = “581”

Step-2:

Subtract from “300”

We would get:

581 – 300

= 281

Step – 3:

Subtract from “30”

We would get:

281 – 30

= 251

Step- 4:

Subtract from “9”

Hence the answer is:

251 – 9

= 242