## Act 1

1. Will the baby be a boy or girl?

2. Write down a guess.

Note: This lesson is based on a fun myth that a baby’s gender can be determined by their heart rate. Consider sharing with students that this isn’t scientifically accurate but instead a fun way for expecting parents to anticipate their new baby.

## Act 2

3. What information would be useful to figure this out?

4. Write down some questions you have in your head right now.

## Act 3

## Sequel

5. Write an inequality to describe the conditions needed for a girl.

6. Write an inequality to describe the conditions needed for a boy.

7. What would happen if the baby had a heartbeat of exactly 140 beats per minute?

**Common Core Standards**

6.RP.A.3

Use ratio and rate reasoning to solve real-world and mathematical problems, e.g., by reasoning about tables of equivalent ratios, tape diagrams, double number line diagrams, or equations.

**TEKS**

6.4(H)

convert units within a measurement system, including the use of proportions and unit rates