Decide if each statement is true or false. Be prepared to explain your reasoning.

Solve each riddle to find the mystery number.

For each riddle:

• Write an equation that represents the riddle. Write a ? for the unknown.

• Represent the equation on the number line. Write the mystery number.

1. I started at 15 and jumped 17 to the right. Where did I end?

   Equation: _______________________________

   Mystery number: _______________________

2. I started at a number and jumped 20 to the left. I ended at 33. Where did I start?

   Equation: _______________________________

   Mystery number: _______________________

3. I started at 42 and ended at 80. How far did I jump?

   Equation: _______________________________

   Mystery number: _______________________

4. I started at 76 and jumped 27 to the left. Where did I end?

   Equation: _______________________________

   Mystery number: _______________________

5. I started at a number and jumped 19 to the right. I ended at 67. Where did I start?

   Equation: _______________________________

   Mystery number: _______________________

6. I started at 92 and ended at 33. How far did I jump?

   Equation: _______________________________

   Mystery number: _______________________

Find the number that makes each equation true.

Show your thinking using a number line.