Add Thousandths Decimal Worksheet

Adding decimals to the thousandths place is where fifth graders prove they really understand place value. Once a number runs past the tenths and hundredths columns, students can no longer rely on counting whole units, and every digit has to be lined up under the digit that shares its place. This Add Thousandths Decimal Worksheet gives students focused practice with the standard addition algorithm applied to decimal numbers, including the regrouping that happens when a column of tenths or hundredths adds up to ten or more. Lining up the decimal points, carrying a one into the next column, and keeping the answer anchored to the same place value are exactly the habits that carry forward into measurement, money, and data work.

This 5th grade decimals worksheet is built as a two-part page. Part A gives six column addition problems, each already stacked in a place value grid so the decimal points sit in their own column and students can concentrate on adding and regrouping. Part B moves the same skill into three real world word problems about packing a backpack, riding a bicycle, and measuring water, where students have to find the total and label it with the correct unit. Use it as guided practice after a mini lesson, as morning work, as a quick formative check, or as homework that parents can score in a minute.

What’s Included

• 1 print-ready PDF worksheet
• Answer key
• 6 decimal column addition problems and 3 applied word problems

There are three reasons this resource helps students learn the skill. First, every problem on the page is pre-stacked in a place value grid, so a student who is still shaky on alignment gets an accurate model of what correct work looks like instead of practicing a crooked stack. Second, all six problems in this Add Thousandths Decimal Worksheet require regrouping, several of them across the decimal point into the ones place, so students meet the hardest part of the skill rather than skating past it. Third, the word problems in Part B attach the arithmetic to mass, distance, and volume, which is where decimals actually live, and the answer key lets students check and correct their own thinking right away.

Teachers and parents can stretch this skill in other ways too. Hand students a grocery receipt or a race results sheet and ask them to total two or three amounts. Let them weigh classroom objects on a digital scale and add the readings. Play a quick round of place value war, where each player draws four digit cards, builds a decimal, and the pair with the greater sum wins the round. Reading decimals out loud, saying three and four hundred fifty thousandths rather than three point four five zero, also makes the place value names stick.

Related Resources

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• Adding Decimals Word Problems Worksheet
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