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CCSS.MATH.CONTENT.4.NF.C.5

## Adding Fractions – Tenths and Hundredths

Sometimes, a problem may ask you to add two fractions that don’t share the same denominator such as adding tenths and hundredths. But how do you add tenths and hundredths? Find out all you need to know about adding fractions with uneven denominators with the example in this text and by watching the video.

## Adding Tenths and Hundredths– Example

How do you add fractions with uneven denominators? When adding fractions with tenths and hundredths, first, set up the problem. Next, look at the denominator, the bottom number, of both fractions. Since they’re not the same, or like, we need to convert one fraction to have the same denominator as the other. To do this, we can multiply to fractions with the ten denominator by ten to make one hundred. When we do this, we also need to multiply the numerator, the top number, by ten as well. Now both denominators are one hundred, we can solve the problem! ## Adding Tenths and Hundredths – Summary

Remember, when adding tenths and hundredths fractions, make sure you have like denominators before solving the problem. The denominator of the sum will always remain the same, and you only need to add together the numerators. The illustration below shows what you need to keep in mind when adding tenths and hundredths. Below, you can see the necessary steps to adding fractions with uneven denominators.

Step # What to do
1 Set up the problem and look at the denominators.
2 Multiply the smaller denominator until it
matches the other denominator.
Remember to multiply the numerator as well.
3 Once both denominators are the same,

After watching this video, you will find more interactive exercises, worksheets and further activities on adding tenths and hundredths with questions and answers.

## Adding Tenths and Hundredths exercise

Would you like to apply the knowledge you’ve learned? You can review and practice it with the tasks for the video Adding Tenths and Hundredths.
• ### Identify the different parts of the equation.

Hints

The numerator is above the fraction bar, and indicates how many pieces of the whole are being used in this fraction.

The 6 in this fraction is the denominator.

The operation used in this equation is addition.

Solution

The numerator is always above the fraction bar, and indicates how many pieces of the whole we are using in this fraction.
The denominator is always below the fraction bar, and shows how many pieces the whole has been divided into.
There is no multiplication or subtraction used in this equation.

• ### Identify the statements that accurately describe tenths and hundredths.

Hints

$\mathbf{\frac{1}{10}}$ is one piece from a group of 10.

$\mathbf{\frac{1}{100}}$ is one piece from a group of 100.

Solution
• A tenth represents one part of a whole, divided into 10 equal pieces.
• A hundredth represents one part of a whole divided into 100 equal parts.
• One hundredth can by written as a fraction by writing 1 as the numerator and 100 as the denominator.
• In a fraction, the numerator, or number on top, shows how many of something there is. So the fraction one tenth must be written as $\mathbf{\frac{1}{10}}$.
• 10 and 100 can both be divided by 2's, 5's and 10's, but not by 7.
• ### Identify the correct order or steps to solve.

Hints

In order to add tenths and hundredths, the denominator must first be the same. In the fraction $\frac{1}{10}$, 10 is the denominator.

To make common denominators, the best strategy is to multiply smaller numbers, like 10, untill they equal the larger denominator in the other fraction.

$\mathbf{\frac{50}{100}}$ can be simplified to a smaller fraction by dividing both the numerator and denominator by 50.

Solution

• Check if the two fractions have like denominators.
• If the fractions do NOT have like denominators, multiply the denominator of the smaller fraction until it is the same. Multiply the numerator by the same.
• Once all fractions have the same denominator, add the equivalent fractions together to get the sum.
• Simplify by dividing the numerator and denominator of the sum by a common denominator, if possible.
• ### Match each addition expression with the correct sum.

Hints

30 ÷ 10 = 3
100 ÷ 10 = 10

70 ÷ 10 = 7
100 ÷ 10 = 10

20 ÷ 20 = 1
100 ÷ 20 = 50

Solution

Problem 1

• $\frac{10}{100}$ + $\frac{2}{10}$ = ?
• $\frac{2}{10}$ x $\frac{1}{10}$ = $\frac{20}{100}$
• $\frac{10}{100}$ + $\frac{20}{100}$ = $\frac{30}{100}$
• $\frac{30}{100}$ ÷ $\frac{10}{10}$ = $\frac{3}{10}$
Problem 2
• $\frac{20}{100}$ + $\frac{5}{10}$ = ?
• $\frac{5}{10}$ x $\frac{10}{10}$ = $\frac{50}{100}$
• $\frac{20}{100}$ + $\frac{50}{100}$ = $\frac{70}{100}$
• $\frac{70}{100}$ ÷ $\frac{10}{10}$ = $\frac{7}{10}$
Problem 3
• $\frac{7}{100}$ + $\frac{10}{100}$ = $\frac{17}{100}$
Problem 4
• $\frac{10}{100}$ + $\frac{10}{100}$ = ?
• $\frac{10}{100}$ + $\frac{10}{100}$ = $\frac{20}{100}$
• $\frac{20}{100}$ ÷ $\frac{20}{20}$ = $\frac{1}{50}$

• ### Calculate the sum of the equation.

Hints

The first step to solve the problem is to identify the unknown amount with a question mark (?).

In order to add tenths and hundreds, you first have to create like denominators using multiplication. Multiply BOTH the numerator (above) and denominator (below).

Like denominators: $\mathbf{\frac{10}{20}}$ + $\mathbf{\frac{2}{20}}$

Different denominators: $\mathbf{\frac{1}{50}}$ + $\mathbf{\frac{1}{10}}$

Once you have like denominators, you can add your fractions to find the sum. Only add the numerators! (The number above).

$\mathbf{\frac{30}{100}}$ + $\mathbf{\frac{20}{100}}$ = ?

Once you have added your fractions and have the sum, check if the sum can be simplified, or made smaller, using division. Divide BOTH the numerator (above) and denominator (below).

$\mathbf{\frac{50}{100}}$ ÷ $\mathbf{\frac{50}{50}}$ = ?

Solution
• $\frac{3}{100}$ + $\frac{2}{10}$ = ?
• $\frac{2}{10}$ x $\frac{10}{10}$ = $\frac{20}{100}$
• $\frac{30}{100}$ + $\frac{20}{100}$ = $\frac{50}{100}$
• $\frac{50}{100}$ ÷ $\frac{50}{50}$ = $\frac{1}{2}$
• ### Calculate the sum of the equations.

Hints

You will need to first find like denominators before you can solve these equations.

For the equation $\frac{2}{30}$ + $\frac{1}{3}$, the common denominator is 3. How many times must you multiply 3 to equal 30?

Don't forget to simplify fractions when you can!
Example: $\frac{2}{10}$ can be simplified to $\frac{1}{5}$ by dividing by 2.

A piece of scrap paper to write out each step is recommended for this problem!

Solution

Problem 1

• $\frac{1}{4}$ + $\frac{1}{40}$ = ?
• $\frac{10}{40}$ + $\frac{1}{40}$ = ?
• $\frac{10}{40}$ + $\frac{1}{40}$ = $\frac{11}{40}$
• $\frac{11}{40}$ cannot be simplified.
Problem 2
• $\frac{2}{5}$ + $\frac{2}{50}$ = ?
• $\frac{20}{50}$ + $\frac{2}{50}$ = ?
• $\frac{20}{50}$ + $\frac{2}{50}$ = $\frac{22}{50}$
• $\frac{22}{50}$ is equivalant to $\frac{11}{25}$ (divide by 2).
Problem 3
• $\frac{2}{30}$ + $\frac{1}{3}$ = ?
• $\frac{2}{30}$ + $\frac{10}{30}$ = ?
• $\frac{2}{30}$ + $\frac{10}{30}$ = $\frac{12}{30}$
• $\frac{12}{30}$ is equivalant to $\frac{6}{15}$ (divide by 2).
Problem 4
• $\frac{1}{2}$ + $\frac{3}{10}$ = ?
• $\frac{5}{10}$ + $\frac{3}{10}$ = ?
• $\frac{5}{10}$ + $\frac{3}{10}$ = $\frac{8}{10}$
• $\frac{8}{10}$ is equivalant to $\frac{4}{5}$ (divide by 2).