CurrentGK General Knowledge Mathematical Tricks

Dividing A 2- Or 3-digit Number By 16 2/3
Dividing a 2- or 3-digit number by 16 2/3 Select a 2-digit number. (Choose larger numbers when you feel sure about the method.) Multiply by 6 (or by 3 and then 2). Move the decimal point two places to the left.    Example: The 2-digit number chosen to divide by 16 ....
Dividing A 2-digit Number By 12 1/2
Dividing a 2-digit number by 12 1/2 Select a 2-digit number. Multiply it by 8 (or by 2 three times). Move the decimal point 2 places to the left.    Example: The 2-digit number chosen to divide by 12 1/2
is 78. Multiply by 2 three times:
2 × 78 = ....
Dividing A 2-digit Number By 8 1/3
Dividing a 2-digit number by 8 1/3 Select a 2-digit number. Multiply by 6. Divide by 5. Move the decimal point one place to the left.    Example: The 2-digit number chosen to divide by 8 1/3 is 21. Multiply by 6: 6 × 21 = 126 Divide by 5: 126/5 = 25.2 ....
Dividing A 2-digit Number By 7 1/2
Dividing a 2-digit number by 7 1/2 Select a 2-digit number. Multiply it by 4 (or by 2 twice). Divide by 3. Move the decimal point 1 place to the left.    Example: The 2-digit number chosen to divide by 7 1/2
is 42. Multiply by 4: 42 × 4 = 168 Divide ....
Dividing A 2-digit Number By 7 1/7
Dividing a 2-digit number by 7 1/7 Select a 2-digit number. Multiply it by 7. Multiply the product by 2. Move the decimal point two places to the left.    Example: The number chosen to divide by 7 1/7 is 21. Multiply by 7: 7 × 21 = 147 Multiply by 2: 2 ....
Dividing A 2-digit Number By 6 2/3
Dividing a 2-digit number by 6 2/3 Select a 2-digit number. Multiply by 15. Move the decimal point two places to the left.    Example: The 2-digit number chosen to divide by 6 2/3 is 21. Multiply by 15: 15(21) = 210 + 105 = 310 + 5 = 315. Move the decimal point two ....
Dividing A 2-digit Number By 5 5/7
Dividing a 2-digit number by 5 5/7 Select a 2-digit number. Multiply by 7. Divide by 4. Move the decimal point one place to the left.    Example: The 2-digit number chosen to divide by 5 5/7 is 21. Multiply by 7: 7 × 21 = 147 Divide by 4: 147/4 = 36 3/4 ....
Dividing A 2-digit Number By 4 1/6
Dividing a 2-digit number by 4 1/6 Select a 2-digit number. Multiply by 6. Multiply this product by 4. Move the decimal point 2 places to the left.    Example: The 2-digit number chosen to divide by 4 1/6 is 24. Multiply by 6: 6 × 24 = 120 + 24 = 144 ....
Dividing A 2-digit Number By 3 4/7
Dividing a 2-digit number by 3 4/7 Select a 2-digit number. Multiply it by 7. Multiply the product by 4. Move the decimal point 2 places to the left.    Example: The number chosen to divide by 3 4/7 is 21. Multiply by 7: 7 × 21 = 147 Multiply by 4: 4 ....
Dividing A 2- Or 3-digit Number By 3 1/3
Dividing a 2- or 3-digit number by 3 1/3 Select a 2- or 3-digit number. Multiply by 3. Move the decimal point one place to the left.    Example: The 2-digit number chosen to divide by 3 1/3 is 72. Multiply by 3: 72 × 3 = 216 Move the decimal point one place ....

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