Addition and Subtraction of Fractions

Operation on Fractions

Review: Problem Opener

Read and analyze the given situation to answer the following questions.

Situation:

For the month of April, Elizabeth donated 3/10 to buy some goods for the community pantry in their barangay. Every Sunday, she was able to donate 1/10 of her monthly allowance consistently for the same month.

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Assuming that her allowance that month was Php1000.00, how much did she donate for the online mass every Sunday?

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Assuming that her allowance that month was Php1000.00, how much did she donate for the online mass every Sunday?

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What part of her allowance was allotted for all the donations? (Answer must be in fraction)

Open Ended

How do we add similar fractions?

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 $\frac{1}{5}+\frac{2}{5}=N$  

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 $\frac{11}{13}-\frac{6}{13}=N$  

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 $\frac{2}{9}+\frac{4}{9}=N$  

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 $\frac{11}{15}-\frac{8}{15}=N$  

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 $\frac{3}{7}+\frac{6}{7}-\frac{1}{7}=N$  

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How many more kilometers did Shannon run on Friday than on Saturday? Use "km" as your unit.

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Lincoln wants to mix 1 1/8 liters of red paint with 2 7/8 liters of blue paint to make purple paint. How many liters of purple paint will Lincoln make by mixing the two colors? Use "L" as your unit.

Fill in the Blanks

 $11\frac{2}{3}\ -\ 9\frac{1}{3}=N$  

Poll

I can still remember how to find LCM or least common multiple.

• Yes, I can still remember and I can do it

• Yes, I can still remember but I think I need examples

• Not anymore

Fill in the Blanks

 $\frac{3}{4}+\frac{1}{2}=N$  

Fill in the Blanks

 $\frac{4}{5}-\frac{5}{7}=N$  

Fill in the Blanks

 $1\frac{3}{5}+2\frac{2}{3}=N$