Maths Tricks with Numbers

Trick 1:Quick Square

Step1:

If you need to square a 2 digit number ending in 5, you can do so very easily with this trick.

Step2:

Mulitply the first digit by itself + 1, and put 25 on the end.

Step3:

That is all!

Step4:

Ex:25 ie(2*(2+1))&25

Answer:625

Trick 2: Multiply by 5

Step1:

Take any number, then divide it by 2

Step2:

If the result is whole, add a 0 at the end.

Step3:

If it is not, ignore the remainder and add a 5 at the end.

Step4:

2682 x 5 = (2682 / 2) & 5 or 0

Step5:

2682 / 2 = 1341 (whole number so add 0)

Step6:

Ans:13410

Step7:

Let’s try another:5887 x 5,2943.5 (fractional numbers (ignore remainder, add 5)

Answer: 29435

Trick 3: Tough Multiplication

Step1:

If you have a large number to multiply and one of the numbers is even, you can easily subdivide to get to the answer

Step2:

Ex:32 x 125, is the same as: 16 x 250 is the same as: 8 x 500 is the same as: 4 x 1000 = 4,000

Trick 4: Subtracting from 1,000

Step1:

To subtract a large number from 1,000 you can use this basic rule: subtract all but the last number from 9, then subtract the last number from 10:

Step2:

Ex:1000-648

Step3:

subtract 6 from 9 = 3

Step4:

subtract 4 from 9 = 5

step5:

subtract 8 from 10 = 2

Answer: 352