Add & Subtract Fractions Lesson

Add Fractions: Like Denominators

By Kathi McDonagh

​REMEMBER!!!

​The numerator of a fraction is the top number.

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The denominator of a fraction is the bottom number.​

​Its easy when the denominators are the same

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RIf the denominators are the same add the numerators and leace the denominators alone.

Some text here about the topic of discussion

Add or subtract the numerators! aka: the top part of the fraction.

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Leave the denominators alone (unless it is a 10 or 100...then you know what to do!).

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Multiple Select

Choose all of the fractions that have a 3 in the numerator.

• $$\frac{3}{8}$$

• $$\frac{1}{3}$$

• $$\frac{4}{3}$$

• $$\frac{3}{5}$$

Multiple Select

Choose all of the fractions that have a 7 in the denominator.

• $$\frac{7}{8}$$

• $$\frac{1}{7}$$

• $$\frac{5}{7}$$

• $$\frac{7}{12}$$

​All fractions should be written in simplest form.

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We can also say the fraction is in lowest terms or reduced.​

Multiple Choice

Choose the fraction that is in lowest terms.

• 4/6

• 1/2

• 2/4

• 5/15

Multiple Choice

Choose the fraction that is in simplest form.

• 5/10

• 3/4

• 2/8

• 7/21

​Adding Fractions with Like Denominators

• Add the numerators

• Write the like denominator

• Reduce the fraction to simplest form

Multiple Choice

$$\frac{4}{7}\ +\ \frac{2}{7\ }\ =$$

• $$\frac{6}{7}$$

• $$\frac{6}{14}$$

• $$\frac{8}{49}$$

Multiple Choice

$$\frac{2}{10}\ \ +\ \ \frac{5}{10}\ =$$

• $$\frac{10}{10}$$

• $$\frac{7}{10}$$

• $$\frac{10}{20}$$

Multiple Choice

$$\frac{6}{11}-\frac{4}{11}=?$$  

• $$\frac{1}{11}$$  

• $$\frac{10}{11}$$  

• $$\frac{10}{22}$$  

• $$\frac{2}{11}$$  

Multiple Choice

$$\frac{4}{\ 5\ }\ -\ \frac{2}{5}\ =$$  

• $$\frac{2}{10}$$  

• $$\frac{2}{0}$$  

• $$\frac{2}{5}$$  

Multiple Choice

$$\frac{4}{\ 5\ }\ -\ \frac{2}{5}\ =$$  

• $$\frac{2}{10}$$  

• $$\frac{2}{0}$$  

• $$\frac{2}{5}$$  

Multiple Choice

$$\frac{11}{12}-\frac{4}{12}=$$  

• $$\frac{5}{12}$$  

• $$\frac{6}{12}$$  

• $$\frac{7}{12}$$  

Draw

Shade in 1/2 of the object.

Draw

Divide the square in to four equal parts.

Poll

I love math!

• Absolutely!

• Definitely!

• Even more than recess!