Math Tricks

What’s the Number Trick?

Work Time

What's the Number Trick?

  • Which of these tricks will always give you the number you started with?

Trick A * Think of a number. * Multiply by 3. * Multiply by 4. * Divide by 12.

Trick B * Think of a number * Add 4. * Multiply by 2. * Divide by 4.

Trick C * Think of a number. * Subtract 3. * Multiply by 3. * Divide by 3. * Add 3.

Trick D * Think of a number. * Multiply by 5. * Add 5. * Divide by 5. * Subtract 1.

 

Hint: 

  • Follow the steps in each trick. Be sure to start with a variety of numbers.
  • Write each step as an expression, and then evaluate the expression before moving on to the next step.