Decimal Addition Worksheets — Free Printable
Decimal addition is where place value extends past the ones column. These worksheets generate numbers with a fixed number of decimal places (tenths or hundredths) so students practice lining up the decimal point — the classic step that trips up learners. Turn hundredths on for a harder set.
Sample problems (new ones below)
Worksheet controls
Common Core aligned: 2.OA.B.2, 2.NBT.B.5, 2.NBT.B.7
Your settings are saved on this device and restored next time (teacher template reuse).
Get notified when new worksheets ship
Teachers and parents: leave your email and we'll let you know when new worksheet types, grade ranges, or seasonal practice packs are added. A few emails a year, unsubscribe anytime. (Adults only — this form is not for students, and UnitFig collects no student data.)
Clicking Subscribe opens your mail app with a ready-to-send note. Nothing is stored on this website. See our Privacy Policy.
Teaching tips for decimals
- •Always line up the decimal points before adding — the digits after the decimal point align by place value just like whole numbers.
- •Model "fill with zeros": 0.3 + 0.25 → 0.30 + 0.25. Writing the trailing zero makes the columns visually match.
- •Estimate first: 0.3 + 0.25 should be "about half". Estimation catches off-by-one decimal errors immediately.
Common mistakes to watch for
Check your answers with the tools
Grade & standards alignment
These decimals worksheets target the Grades 4–5 band of the Common Core State Standards for Mathematics (CCSSM). The relevant CCSS math domains are:
Source: Common Core State Standards for Mathematics (2010). National Governors Association Center for Best Practices (NGA Center) & Council of Chief State School Officers (CCSSO). Retrieved 2026-08-11 from https://www.corestandards.org/Math/.
The CCSSM are public, open-license standards; this alignment is provided for planning and is not an official endorsement by the standards authors.
How these worksheets are built (accuracy & trust)
- •Problems are generated by a deterministic engine using exact integer and rational arithmetic — answers are reduced to lowest terms and never rely on floating-point rounding, so they match the matching UnitFig converter.
- •Grade presets follow the CCSSM progression above; pick a grade to get age-appropriate number ranges.
- •Content is reviewed for accuracy and refreshed each year (2026). Worksheet copy and examples are original and written for classroom use.
Safe for classrooms — zero data collection
UnitFig collects no personal information from children or any visitor. Worksheets run entirely in the browser: no account, no name or email, and student answers never leave the device. We follow a COPPA-aligned, zero-collection design so teachers and parents can use these sheets without a signup wall or privacy concern. See our Privacy Policy.
Frequently Asked Questions
What is the difference between tenths and hundredths?
Tenths have one decimal place (0.1, 0.2…), hundredths have two (0.01, 0.25…). Start with tenths, then switch to hundredths for a challenge.
What grade is decimal addition taught?
Decimal notation is introduced in grade 4 (4.NF.C.6) and operations with decimals are formalized in grade 5 (5.NBT.B.7).
Are the answers exact?
Yes. The engine works with integer math behind the scenes and places the decimal point once at the end, so there are no floating-point rounding surprises.
More worksheets
Last Updated 2026 | Problems are algorithm-generated with the exact NIST/SI constants used by UnitFig converters. Answers are computed programmatically and can be verified with the matching converter.