Boy or Girl?

3 Act Math

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 2 Conditions

Act 3

Act 3


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


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