🧭10 tricks for doing fast math

💜 Class 6 to 12
💜 SSC
💜 BANK
💜 UPCS
💜 STATE PSC
💜 RAILWAYS
💜 DEFENCE
💜 GATE,IES,PSU
💜 TEACHER LEVEL
💜 IIT-JEE
.......................

╔════════════════╗
▒☞ @Maths4magic
╚════════════════╝

🧭10 tricks for doing fast math

1. Adding large numbers

Adding large numbers just in your head can be difficult. This method shows how to simplify this process by making all the numbers a multiple of 10. Here is an example:

644 + 238

While these numbers are hard to contend with, rounding them up will make them more manageable. So, 644 becomes 650 and 238 becomes 240.

Now, add 650 and 240 together. The total is 890. To find the answer to the original equation, it must be determined how much we added to the numbers to round them up.

650 – 644 = 6 and 240 – 238 = 2

Now, add 6 and 2 together for a total of 8

To find the answer to the original equation, 8 must be subtracted from the 890.

890 – 8 = 882

So the answer to 644 +238 is 882.

╔════════════════╗
▒☞ @Maths4magic
╚════════════════╝

2. Subtracting from 1,000

Here’s a basic rule to subtract a large number from 1,000: Subtract every number except the last from 9 and subtract the final number from 10

For example:

1,000 – 556

Step 1: Subtract 5 from 9 = 4

Step 2: Subtract 5 from 9 = 4

Step 3: Subtract 6 from 10 = 4

The answer is 444.

╔════════════════╗
▒☞ @Maths4magic
╚════════════════╝