Lesson 21 — Reciprocals

🎯 Goal

Understand reciprocals and how to use them for dividing fractions.

📖 Lesson Description

The reciprocal of a fraction \\(a/b\\) is \\(b/a\\). Multiplying a fraction by its reciprocal = 1. Used in fraction division.

🔎 Examples

• Reciprocal of 2/3 = 3/2
• Reciprocal of −4/5 = −5/4
• 1 ÷ 2/3 = 1 × 3/2 = 3/2

✏️ Practice

1. Find the reciprocal of 5/6
2. Find the reciprocal of −3/4
3. Calculate 7/8 ÷ 2/5