CurrentGK General Knowledge Mathematical Tricks

Finding The Square Root Of 2-digit Numbers Ending In 1
Finding the square root of 2-digit numbers  ending in 1 Select a 2-digit number and square it. Drop the last two digits of the square. Find the largest square root of the remaining digits.
This is first digit of the square root. The second digit is 1. ....
Dividing A Repeating 6-digit Number By 37037,
Dividing a repeating 6-digit number by 37037, Select a 6-digit number repeating number. Repeat these digits to make a 6-digit number. Multiply a single digit by 3, then by 5.    Example: If the 6-digit repeating number selected is 333333: Multiply 3 × 3: 9 ....
Dividing A Repeating 6-digit Number By 15873
Dividing a repeating 6-digit number by 15873 Select a repeating 6-digit number . The answer is 7 times the first digit of the number!    Example: 777777 / 15873 = 7 × 7 = 49. 555555 / 15873 = 7 × 5 = 35. 999999 / 15873 = 7 × 9 = 63. Not very ....
Dividing A 2-digit Number By 87 1/2
Dividing a 2-digit number by 87 1/2 Select a 2-digit number. Multiply it by 8. Divide by 7. Move the decimal point 2 places to the left.    Example: The 2-digit number chosen to divide by 87 1/2
is 31. Multiply by 8: 31 × 8 = 248 Divide by 7: 248/7 = ....
Dividing A 2-digit Number By 83 1/3
Dividing a 2-digit number by 83 1/3 Select a 2-digit number. Multiply it by 12. Move the decimal point three places to the left.    Example: The 2-digit number chosen to divide by 83 1/3
is 21. Multiply by 12: 12 × 21 = 252. Move the decimal point three ....
Dividing A 2-digit Number By 45
Dividing a 2-digit number by 45 Select a 2-digit number. Divide by 5. Divide the resulting number by 9.    Example: If the number chosen to divide by 45 is 32: Divide by 5: 32/5 = 6.4 Divide the result by 9: 6.4/9 = .71 1/9 So 32 divided by 45 = .71 1/9. ....
Dividing A 2-digit Number By 40
Dividing a 2-digit number by 40 Select a 2-digit number. Multiply it by 5. Divide the result by 2. Move the decimal point two places to the left.    Example: The 2-digit number chosen to divide by 40 is 21. Multiply by 5: 5 × 21 = 105. Divide the result by ....
Dividing A 2- Or 3-digit Number By 35
Dividing a 2- or 3-digit number by 35 Select a 2-digit number. (Choose larger numbers when you feel sure about the method.) Multiply by 2. Divide the resulting number by 7. Move the decimal point 1 place to the left.    Example: If the number chosen to divide by ....
Dividing A 2- Or 3-digit Number By 33 1/3
Dividing a 2- or 3-digit number by 33 1/3 Select a 2-digit number (progress to larger ones). Multiply it by 3. Move the decimal point 2 places to the left.    Example: The 2-digit number chosen to divide by 33 1/3 is 46. Multiply by 3: 3 × 46 = 3(40 + 6) = 120 ....
Dividing A 2- Or 3-digit Number By 25
Dividing a 2- or 3-digit number by 25 Select a 2-digit number. (Choose larger numbers when you feel sure about the method.) Multiply by 4 (or by 2 twice). Move the decimal point two places to the left.    Example: The 2-digit number chosen to divide by 25 is 38. ....

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