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Adding and Subtracting Fractions

Learn essential strategies to add and subtract fractions with ease, including finding the Least Common Denominator and using the four square method. Practice problems and answers provided for better understanding.

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Adding and Subtracting Fractions

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  1. Adding and Subtracting Fractions Number Sense 1.2

  2. In order to add/subtract fractions, the denominator must be the same. Example: ¼ + 2/4 = ¾ If the denominator is not the same, you must find the least common multiple of the denominators (This can also be called the Least Common Denominator). • How to add/subtract fractions.

  3. 3/8 + 1/6 = [8 6] 4 3 2  4 3 LCM = 24 • Unlike Denominators: • Step 1: • Use the upside down cake method to determine the LCM • Step 2: The LCM becomes the new denominator for each fraction. 2

  4. Step 3: • Determine what factor multiplies to make the LCM. Multiply the numerator by that factor. • Step 4: Always simplify when possible

  5. 2/3 + 1/5 • Four Square Method: • Write the steps in you own words. • 1) • 2) • 3) • 4) 1 5 2 Denominator 3 Answer: 13/15

  6. Practice Add. Answers: 1.) 13/15 2.) 7/9 3.) 16/21 4.) 7/8 5.) 5/8 • 1.) 2/3 + 1/5 • 2.) 4/9 + 1/3 • 3.) 3/7 + 1/3 • 4.) 1/2 + 3/8 • 5.) 3/8 + 1/4

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