1. Add & Subtract Rational Numbers
Lesson 7

2. Don’t forget your integer rules for adding and subtracting!
To add
Same Sign (add the absolute values)
Different Sign (subtract the absolute values)
To subtract
KEEP the first number the same
CHANGE subtraction to addition
CHANGE the second number to it’s opposite.
Integer Rules

3. Add & Subtract Decimals
To add or subtract decimals, line up the decimal vertically.
Put in zeros so all numbers have the same length.
Line up the dot! pZyY6mM3g
Add & Subtract Decimals

4. Practice Adding & Subtracting Decimals

5. To add fractions you must first have common denominators.
Scroll Down and Watch the animation!
Add fractions

6. Add mixed numbers Change mixed numbers to improper fractions.
Find common denominators.
Add
Convert back to mixed number and simplify.
Add mixed numbers

7. Practice adding fractions & Mixed numbers

8. To subtract fractions you must have common denominators.
Scroll down and watch the animation!
Subtract fractions

9. Subtract mixed numbers
Change mixed numbers to improper fractions.
Find common denominators.
Subtract
Convert back to mixed number and simplify.
Subtract mixed numbers

10. Practice subtracting fractions & mixed numbers