Add and Subtract Fractions With Unlike Denominators

Add and Subtract Fractions with Unlike Denominators, Part 1

5th Grade Topic 7 Review

REVIEW

Adding and Subtracting Fractions: What we have already learned

​1. The NUMERATOR is the number on top.

2. The DENOMINATOR is the number on the bottom.​

3. When you add/subtract fractions, the denominators MUST be the SAME.

4.​ Add/subtract the numerators; copy the denominators.

​5. Reduce/simplify if needed.​

Multiple Choice

The number on the top of a fraction is called the

• Denominator

• Numerator

• Answer

• Hat

Multiple Choice

The number on the bottom of a fraction is called the

• Shoe

• Sum

• Numerator

• Denominator

Poll

How confident are you in understanding numerator and denominator?

• YES! I know which is which for SURE.

• I think I answered correctly.

• I have no idea.

Multiple Choice

When adding and subtracting fractions, the denominators MUST be

• negative

• different

• the same

• greater

Multiple Choice

$$\frac{1}{6}\ +\ \frac{4}{6}\ =$$  

• $$\frac{5}{6}$$  

• $$\frac{3}{6}$$  

• $$\frac{5}{12}$$  

• $$\frac{4}{12}$$  

Multiple Choice

$$\frac{7}{8}\ -\ \frac{2}{8}\ =$$  

• $$\frac{5}{0}$$  

• $$\frac{9}{8}$$  

• $$\frac{9}{16}$$  

• $$\frac{5}{8}$$  

Poll

How confident are you in understanding how to add and subtract fractions with LIKE (the same) denominators?

• YES! I can teach this skill.

• I think I can do it, but I might need help.

• I have no idea.

Multiple Choice

Reduce/simplify this fraction: $$\frac{4}{6}$$  

• It is already in simplest form.

• $$\frac{2}{3}$$  

• $$\frac{1}{2}$$  

• $$\frac{3}{4}$$  

Multiple Choice

Reduce/simplify this fraction:   $$\frac{4}{12}$$  

• It is already in simplest form.

• $$\frac{2}{3}$$  

•   $$\frac{1}{3}$$  

•   $$\frac{1}{4}$$  

Multiple Choice

Reduce/simplify this fraction:    $$\frac{7}{8}$$  

• It is already in simplest form.

• $$\frac{2}{3}$$  

•   $$\frac{1}{3}$$  

•   $$\frac{1}{4}$$  

Poll

How confident are you in understanding how to reduce fractions?

• YES! I got all three answers correct for SURE.

• I think I understand but I'm not sure.

• I have no idea.

NEW

Adding and Subtracting Fractions: What we learned this week

​1. When the denominators are different, ask yourself if the smaller denominator can be changed (multiplied) to match the larger.

2. If it can, multiply the denominator by the number needed to make them match.

​3. Whatever you do to the BOTTOM of the fraction, you must do to the TOP.​ Multiply the numerator by the same number you used the change the denominator.

4. Add/subtract, then reduce if needed.​

​

Multiple Choice

$$\frac{1}{2}\ +\ \frac{1}{4}\ =$$  

• $$\frac{2}{4}$$  

• $$\frac{2}{6}$$  

• $$\frac{2}{8}$$  

• $$\frac{3}{4}$$  

Multiple Choice

  $$\frac{7}{8}\ -\ \frac{1}{4}\ =$$  

•   $$\frac{5}{8}$$  

•   $$\frac{6}{4}$$  

•   $$\frac{6}{8}$$  

• $$\frac{3}{4}$$  

Multiple Choice

   $$\frac{1}{15}\ +\ \frac{2}{5}\ =$$  

•    $$\frac{3}{20}$$  

•    $$\frac{7}{15}$$  

•    $$\frac{3}{15}$$  

•   $$\frac{3}{10}$$  

Multiple Choice

$$\frac{3}{4}\ -\ \frac{1}{12}\ =$$  

• $$\frac{2}{12}$$  

• $$\frac{2}{8}$$  

• $$\frac{2}{3}$$  

• $$\frac{4}{12}$$  

Multiple Choice

$$\frac{1}{2}\ +\ \frac{5}{6}\ =$$  

• $$\frac{6}{8}$$  

• $$1\frac{1}{3}$$  

• $$\frac{6}{6}$$  

• $$\frac{4}{6}$$  

Poll

How confident are you in understanding how to add and subtract fractions with UNLIKE (different) denominators?

• YES! I got all five answers correct for SURE.

• I think I understand but I'm not sure.

• I have no idea.