1. Math Message
1/6 of 30= 5/6 of 30 = 1/8 of 48 = 5/8 of 48 = 1/7 of 56 = 4/7 of 56 =

3. Adding Fractions with SAME Denominators
When adding fractions with like denominators, ONLY add the numerators.
Keep the denominator the same.
4 + 1 =

4. Try it!

5. Subtracting Fractions with SAME Denominators
When subtracting fractions with like denominators, ONLY subtract the numerators.
Keep the denominator the same.
4 - 1 =

6. Try it!
3 – 1 = ___
25 – 13 = ___

7. Brainpop
BrainPOP | Adding and Subtracting Fractions

8. You can add any fraction with DIFFERET denominators…
Use what you know about equivalent fractions to make the two fractions have the same denominator.

9. Uncommon Denominators
You have to make them common denominators by finding the LCD
LCD - least common denominator (lowest multiple of both numbers)
Multiply numerator and denominator by the same number to get same denominators
Rewrite the fractions to match
2/3 + 2/6
2/3 * 2/2= 4/6
4/6 + 2/6= 6/6 = 1

10. Adding and Subtracting Fractions

11. S.L. 7.5
Math Box 7.5
U:\Math\iTLG Grade 4