Tips and trick

Trick 1
Square numbers ending in 5
85 x 85 = 7225
Step 1 – Multiply the first digit by the first digit plus one:
8 x (8 + 1) = 72
Step 2 – Write the number 25 next to the number from the first step: 7225
45 x 45 = Ans 2025
How this calculation find
Step 1 – 4 x (4 + 1) = 20
Step 2 – 2025
Ans 2025 so sample
Trick 2
Square numbers in the 50’s
58 x 58 = 3364
Step 1 – Add 25 to the ones digit: 25 + 8 = 33
Step 2 – Square the ones digit number:
8 x 8 = 64
Step 3 – Place the result from step 2 next to the result from
Result: 3364
Trick 3-
Divide by 5, 50, 500, etc..
52 / 5 = 10.4
Step 1 – Multiply the number being divided by two: 52 x 2 = 104
Step 2 – Shift the number from step 1 by one decimal point
Ans: 10.4
482 / 50 = 9.64
Step 1 – 482 x 2 = 964
Step 2 – Shift the number from step 1 by two decimal points (for dividing by 500 shift by three decimal points):
Ans-9.64
Trick 4
Multiply by 9, 99, 999, etc..
56 x 99 = 5544
Step 1 – Place a zero at the end for each 9:
As 5600
Step 2 – Subtract the original number from step 1
ie : 5600 – 56 = 5544
Ans 5544

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