CurrentGK General Knowledge Mathematical Tricks

Dividing A 2-digit Number By 3 1/8
Dividing a 2-digit number by 3 1/8 Select a 2-digit number. Multiply by 32 (multiply left to right: 30 times the number plus 2 times the number). Move the decimal point two places to the left.    Example: The 2-digit number chosen to divide by 3 1/8 is 31. Multiply ....
Dividing A 2-digit Number By 2 2/3
Dividing a 2-digit number by 2 2/3 Select a 2-digit number. Multiply by 3. Divide by 8.    Example: The 2-digit number chosen to divide by 2 2/3 is 32. Multiply by 3: 3 × 32 = 96 Divide by 8: 96/8 = 12 So 32 divided by 2 2/3 = 12.    See ....
Dividing A 2-digit Number By 1 2/7
Dividing a 2-digit number by 1 2/7 Multiply the number by 7. Divide by 9.      Example: If the 2-digit number chosen to divide by 1 2/7 is 32: Multiply by 7: 7 × 32 = 210 + 14 = 224 Divide by 9: 224/9 = 24 8/9 So 32 / 1 2/7 = 24 8/9. ....
Dividing A 2-digit Number By 1 1/4
Dividing a 2-digit number by 1 1/4 Select a 2-digit number. Multiply by 8. Move the decimal point one place to the left.    Example: The 2-digit number chosen to divide by 1 1/4 is 32. Multiply by 8: 8 × 32 = 240 + 16 = 256 Move the decimal point one place to ....
Dividing A Number By 1 1/5
Dividing a number by 1 1/5 Select a number. Multiply it by 5 Divide the result by 6.    Example: The number chosen to divide by 1 1/5 is 24. Multiply by 5: 5 × 24 = 120 Divide by 6: 120/6 = 20 So 24 divided by 1 1/5 = 20.    See the ....
Dividing A 2-digit Number By 1 1/6
Dividing a 2-digit number by 1 1/6 Select a 2-digit number. Multiply by 6. Divide by 7.    Example: The 2-digit number chosen to divide by 1 1/6 is 24. Multiply by 6: 6 × 24 = 120 + 24 = 144 Divide by 7: 144/7 = 20 4/7 So 24 divided by 1 1/6 = 20 4/7. ....
Dividing A 2-digit Number By 1 1/7
Dividing a 2-digit number by 1 1/7 Select a 2-digit number. Multiply it by 7. Divide the product by 8.    Example: The number chosen to divide by 1 1/7 is 26. Multiply by 7: 7 × 26 = 140 + 42 = 182 Divide by 8: 182/8 = 22 3/4 So 26 divided by 1 1/7 = 22 ....
Dividing A 2-digit Number By 1 1/8
Dividing a 2-digit number by 1 1/8 Select a 2-digit number. Multiply by 8. Divide the result by 9.    Example: The 2-digit number chosen to divide by 1 1/8 is 42. Multiply by 8: 8 × 42 = 320 + 16 = 336 Divide by 9: 336/9 = 37 1/3 So 42 divided by 1 1/8 = 37 ....
Dividing A 2-digit Number By 1 1/9
Dividing a 2-digit number by 1 1/9 Select a 2-digit number. Multiply by 9. Move the decimal point one place to the left.    Example: The 2-digit number chosen to divide by 1 1/9 is 24. Multiply by 9: 9 × 24 = 180 + 36 = 216 Move the decimal point one place to ....
Multiplying A Repeating 4s Number By 44
Multiplying a repeating 4's number by 44 Choose a repeating 4's number (444, etc.) Multiply it by 44 The product is:
- first two digits are 19
- next digits are repeating 5's - two fewer than the repeating 4's in the original number
- last two digits are 36.

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