Lesson Steps:

1. Find a common Denominator by multiplying them together
10 * 15 = 150
2. Multiply the Numerators
7/10 * 15 = 105/150
2/15 * 10 = 20/150
3. Subtract the factions
105/150 - 20/150 = 85/150
4. Simplify by finding the least common multiple between 85 and 150 which is 5
85/5 = 17
150 / 5 = 30

The answer is 17/30

Answer:

17/30

Grade: 9
Level: Highschool
Subject: Math
Topic: Fractions