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### Adding and subtracting fractions with like denominators

• 1. Adding and Subtracting Fractions with like Denominators
• 2. What the heck is a numerator and denominator? Fractions are made of two parts; the numerator and denominator. The numerator is the number on top of the fraction. The denominator is the number on the bottom of the fraction.
• 3. How do I add fractions with the same denominator? To add or subtract fractions the denominators, or bottom numbers, must be the same.
• 4. Then… You simply add the numerators, or top numbers, and keep the denominators the same.
• 5. Practice on your white board 1. 2. 3.
• 6. Now put into simplest or reduced form Simplest or reduced form means that a number is reduced
• 7. Let’s practice! We’re going to add:3/6 + 1/6 Are the denominators the same? Add the numerators, keep the denominator. You should have gotten 4/6 Do you think we can reduce 4/6? Yes!
• 8. Now let’s reduce! First, we have to factor our numerator and denominator. 4: the factors of 4 are…1,2,4 6: the factors of 6 are…1,2,3,6 Which number in the two list is the Greatest Common Factor (GFC) 2
• 9. Finish reducing Now that we’ve figured out the GFC, divide the numerator and denominator by the GFC 2= 2 2 = 3 Our reduced fraction is now 2/3
• 10. Mixed Numbers and Improper Fractions Sometimes when we add fractions we get an improper fraction as our sum:
• 11. How to turn an improper fraction into a mixed number…it’s so easy! 23/3 is an improper fraction To make it a mixed number you simply have to divide the numerator, top number, by the denominator, bottom number. 23 3= 7 R 2 7 is your whole number, 2 becomes your numerator and 3 stays are your denominator.
• 12. Now you try! Turn each improper fraction into a mixed number 15/2 22/7 9/2 Answers… 7 ½ 3 1/7 4 ½
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