# 5.8: What's My Rule

**What's My Rule? - Write Rules For One-Step Function Tables**

Students identify relationships between the input and output in two-column tables, and write rules that describe the relationship. Rules may be written in words or symbols or both ways. All functions involve one computational step, addition, subtraction, multiplication, or division.

**Solutions**

1.

7 | 9 | |

4 | 6 | |

1 | 3 | |

0 | 2 | |

1. | 2 | 4 |

2. | 9 | 11 |

3. | 3 | 5 |

4. | 8 | 10 |

5 | Rule: |

2.

10 | 6 | |

15 | 11 | |

13 | 9 | |

5 | 1 | |

1. | 8 | 4 |

2. | 14 | 10 |

3. | 7 | 3 |

4. | 16 | 12 |

5 | Rule: |

3.

7 | 37 | |

10 | 40 | |

18 | 48 | |

45 | 75 | |

1. | 31 | 61 |

2. | 14 | 44 |

3. | 8 | 38 |

4. | 29 | 59 |

5 | Rule: |

4.

48 | 28 | |

50 | 30 | |

28 | 8 | |

42 | 22 | |

1. | 67 | 47 |

2. | 59 | 39 |

3. | 75 | 55 |

4. | 34 | 14 |

5 | Rule: |

5.

3 | 12 | |

8 | 32 | |

2 | 8 | |

5 | 20 | |

1. | 1 | 4 |

2. | 7 | 28 |

3. | 6 | 24 |

4. | 9 | 54 |

5 | Rule: |

6.

10 | 2 | |

40 | 8 | |

25 | 5 | |

5 | 1 | |

1. | 15 | 3 |

2. | 35 | 7 |

3. | 20 | 4 |

4. | 45 | 9 |

5 | Rule: |

7.

2 | 18 | |

5 | 45 | |

7 | 63 | |

1 | 9 | |

1. | 4 | 36 |

2. | 3 | 27 |

3. | 6 | 54 |

4. | 9 | 81 |

5 | Rule: |

8.

21 | 7 | |

18 | 6 | |

6 | 2 | |

27 | 9 | |

1. | 9 | 3 |

2. | 24 | 8 |

3. | 12 | 4 |

4. | 30 | 10 |

5 | Rule: |

** and** stand for numbers.

Write the rule. Complete the table.

Write the rule. Complete the table.