Adding Tenths and Hundredths Worksheets for 4th Grade

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Grade 4MathFractionsCCSS 4.NF.C.5

Skill: Adding a tenths fraction and a hundredths fraction by rewriting tenths as hundredths

Preview of the Adding Tenths and Hundredths printable worksheet
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Teaching tips and what to try next

Made for fourth graders who know that 1/10 and 10/100 name the same amount, an idea from Equivalent Fractions: Find the Missing Number. Money is a handy model: a dime is a tenth of a dollar and a penny is a hundredth, so 3/10 + 4/100 is three dimes and four pennies. Writing the same amounts as decimals is next in Fractions to Decimals: Tenths and Hundredths.

10 versions, each with its own answer key

Same skill and layout, a fresh set of problems in every version, so children can keep practicing without repeating a page. Problems are not repeated between versions unless a skill has only a small number of possible problems (for example, the addition facts within 10).

Download all 10 versions (one PDF)All 10 answer keys (PDF)

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About this worksheet

Adding 3/10 and 4/100 looks tricky because the denominators are different. The key is that one tenth is the same as ten hundredths, so 3/10 is 30/100, and 30/100 + 4/100 = 34/100. Fourth graders are expected to write tenths as equivalent hundredths and add them, and this fourth-grade worksheet practices exactly that two-step move. It is also the groundwork for adding decimals later.

The page has twelve problems in one column. Each one adds a fraction with a denominator of 10 and a fraction with a denominator of 100. In about half of the problems the tenths come first, and in the rest the hundredths come first, so children have to find the tenths each time. Every problem has two blanks: first children rewrite the tenths as hundredths, and then they write the sum in hundredths. Every sum is less than one whole, so no mixed numbers come up. Each of the ten versions has new problems and its own answer key.

How to use it: a hundred grid is the best picture for this skill. Shade 3 full columns for 3/10, then 4 more small squares for 4/100, and count 34 squares in all. Remind your child to add only the numerators once the denominators match, which stops the common mistake of writing 34/110. As a bonus, ask your child to write each sum as a decimal, such as 0.34.

The answer key shows both blanks for every problem. For more practice with these fractions, try our Fractions to Decimals: Tenths and Hundredths worksheet. For place value, try our Decimal Place Value: Tenths and Hundredths worksheet.