Summary
A rate is a special ratio where two terms are in different units, such as cents per ounce. Rates help compare different quantities and predict changes.
- Rate — a comparison of two different quantities with different units. Example: 69¢ for 12 ounces.
- Speed — a common rate of change representing distance per time. Example: 60 km/h means 60 kilometers per hour.
Exam Tips
Key Definitions to Remember
- A rate is a comparison of two different quantities with different units.
- Speed is a rate that measures distance per unit of time.
Common Confusions
- Confusing rates with ratios, which compare quantities with the same units.
- Forgetting to include units when calculating rates.
Typical Exam Questions
- How much water will leak from a pipe at 5 ℓ/h in a day? Answer: 120 liters.
- How long to fill 1000 containers at 135 containers per minute? Answer: Approximately 7.41 minutes.
- How many copiers needed to make 6000 copies in 15 minutes? Answer: 8 copiers.
What Examiners Usually Test
- Ability to calculate and interpret rates in different contexts.
- Understanding the relationship between rates, ratios, and proportions.