Grade 5 Adding Decimals to Hundredths
Adding decimals to hundredths in grade 5 — line up the decimal points, not the right-hand digits. Eighteen problems on a printable PDF with the key.
Add the decimals. Line up the decimal points before you add.
- 1.27.78 + 37.41 =
- 2.32.13 + 45.15 =
- 3.4.07 + 10.15 =
- 4.17.64 + 32.94 =
- 5.14.81 + 35.94 =
- 6.7.17 + 28.35 =
- 7.42.51 + 43.22 =
- 8.10.58 + 6.78 =
- 9.22.64 + 29.62 =
- 10.44.07 + 11.13 =
- 11.44.85 + 11.03 =
- 12.28.03 + 48.15 =
- 13.40.77 + 10.87 =
- 14.11.38 + 48.99 =
- 15.5.49 + 44.69 =
- 16.17.66 + 40.29 =
- 17.23.39 + 47.85 =
- 18.34.03 + 38.79 =
What this worksheet covers
The sheet holds eighteen addition problems and prints to a single black-and-white page; the answers follow on page two. What makes this set particular: the operands run to as many as two decimal places, so the decimal points have to be lined up rather than the right-hand digits; numbers reach 48.99. Grade 5, Number & Operations in Base Ten, Common Core 5.NBT.7: that is the exact slot this page fills.
Skills practiced
The skill underneath these problems is decimals and fractions with unlike denominators. Working the page asks a student to keep decimal points aligned rather than right-aligning digits out of habit. A right answer arrived at by an unreliable route is worth less here than a slower, repeatable one.
How to use this worksheet
Have the student work all eighteen problems on their own paper, showing each step, rather than filling answers into the gaps. At grade 5 the method is what is being practised, and an answer with no visible working cannot be diagnosed when it is wrong. Mark it together rather than handing it back scored. The conversation about a wrong answer is where the teaching happens.
One mistake to watch for
Decimals aligned to the right: 3.5 + 0.42 = 3.92.
The right-alignment habit from whole-number addition is being applied to a notation where position, not the right edge, determines value.
Have the student write in the missing placeholder zero (3.50) before adding. Aligning the decimal points then aligns everything else automatically.
Related worksheets
Also aligned to 5.NBT.7
Different problem sets against the same standard — useful when one page was not enough, or when a student needs the same skill approached from another topic.
- Grade 5 Subtracting Decimals to Hundredths — grade 5, 18 problems
- Dividing Decimals to Hundredths — Grade 5 Practice — grade 5, 22 problems
A step either side
The same topic one grade down and one grade up — the easier sheet is often the faster fix when this one is not landing.
- Grade 4 Multi-Digit Addition (Standard Algorithm) — grade 4, 16 problems
- Grade 6 Adding Multi-Digit Decimals — grade 6, 16 problems
Print as many copies of this grade 5 addition worksheet as you need. It was built for decimals and fractions with unlike denominators, and the answer key is already in the file.