1.5 Adding and Subtracting Tricks

Tricks for addition and subtraction.

Lessons

• 1.5.1 Subtracting Reverses
• 1.5.2 Switching Numbers and Negating on Subtraction
• 1.5.3 a/b · (b + 1) + …
• 1.5.4 a/b + b/a Trick
• 1.5.5 a/b - (na - 1)/(nb + 1)