Delaware DeSSA Grade 4 Math Free Worksheets: Printable Test-Prep Worksheets with Answer Keys

Fourth grade is the year a student’s sense of “how big a number can be” stretches way out. Place value reaches the hundred-thousands and beyond, and those numbers have to be read, compared, and rounded with confidence. Multiplication grows into a multi-step procedure. Division starts handing back remainders that need to be interpreted. Fractions become numbers — compared, ordered, added — instead of pictures, and decimals appear for the first time. By spring there are angles and geometry too. It is a genuinely full year.

For a nine- or ten-year-old, that fullness can feel like a lot at once. But fourth-grade math arrives in a sensible order, each skill leaning on the one before, and a student who gets steady practice on each piece tends to find the whole thing holds together.

It is also worth remembering that this is a foundational year, not just a full one. The multi-digit multiplication and division a student practices now is exactly what fifth grade uses for fractions, area, and multi-step problems. The fraction and decimal work this year is the groundwork for ratios, percents, and eventually algebra. Time spent getting these skills steady is not time spent on fourth grade alone — it is invested in every math year that comes after.

These worksheets are built for that kind of patient work. Whether your child is in Wilmington, Dover, Newark, or Middletown, each one isolates a single skill and gives enough practice to make it stick.

What’s on this page

This page holds 43 single-skill PDFs, each aligned to the Delaware Mathematics Standards at Grade 4. Every file commits to exactly one skill, so a student practicing decimal notation is not also being asked about symmetry, and a student working through multi-digit multiplication is not pulled into line plots.

Each PDF begins with a one-page Quick Review — the skill in plain language, with one example worked all the way through. Then 20 practice problems arranged from easy to hard, plus 4 word problems that put the skill into a real-world setting. The last page is a student-facing answer key, with short, friendly explanations a fourth grader can read independently and learn from.

Place Value & Multi-Digit Numbers

• Understanding Place Value Relationships — [4.NBT.A.1] each place is ten times the one to its right
• Reading and Writing Multi-Digit Numbers — [4.NBT.A.2] standard form, word form, and expanded form
• Comparing and Ordering Multi-Digit Numbers — [4.NBT.A.2] use place value and the symbols >, <, and =
• Rounding Multi-Digit Numbers — [4.NBT.A.3] round to any place from tens to hundred-thousands

Multi-Digit Arithmetic

• Adding Multi-Digit Whole Numbers — [4.NBT.B.4] the standard addition algorithm, with regrouping
• Subtracting Multi-Digit Whole Numbers — [4.NBT.B.4] the standard subtraction algorithm, including across zeros
• Multiplying by a One-Digit Number — [4.NBT.B.5] multiply up to four digits by a single digit
• Multiplying Two Two-Digit Numbers — [4.NBT.B.5] the area model and the standard algorithm side by side
• Dividing with Remainders — [4.NBT.B.6] divide and name the leftover as a remainder
• Finding Factors and Multiples — [4.OA.B.4] list every factor of a number and its first multiples
• Prime and Composite Numbers — [4.OA.B.4] exactly two factors means prime; more means composite

Operations & Problem Solving

• Multiplicative Comparisons — [4.OA.A.1] read ‘4 times as many’ as a multiplication statement
• Multiplicative Comparison Word Problems — [4.OA.A.2] solve ‘times as many’ stories with multiplication or division
• Multi-Step Word Problems — [4.OA.A.3] two or more operations in one real-world problem
• Interpreting Remainders — [4.OA.A.3] decide what the leftover means — round up, drop it, or use it
• Number and Shape Patterns — [4.OA.C.5] follow a rule and find the next terms in a pattern

Fractions

• Equivalent Fractions — [4.NF.A.1] the same amount written with different numbers
• Comparing Fractions — [4.NF.A.2] compare fractions with unlike denominators using benchmarks
• Adding Fractions with Like Denominators — [4.NF.B.3a] add the numerators, keep the denominator
• Subtracting Fractions with Like Denominators — [4.NF.B.3a] subtract the numerators, keep the denominator
• Decomposing Fractions — [4.NF.B.3b] break a fraction into a sum of unit fractions
• Adding and Subtracting Mixed Numbers — [4.NF.B.3c] work with the whole and fraction parts, including regrouping
• Multiplying a Fraction by a Whole Number — [4.NF.B.4b] repeated addition of a fraction, written as multiplication
• Fraction Word Problems — [4.NF.B.3d] real-world stories that call for adding or subtracting fractions

Decimals

• Fractions with Denominators 10 and 100 — [4.NF.C.5] rename tenths as hundredths and add the two
• Decimal Notation for Fractions — [4.NF.C.6] write tenths and hundredths as decimals, and back
• Comparing Decimals to Hundredths — [4.NF.C.7] line up the place values and compare with >, <, =
• Adding Decimal Fractions — [4.NF.C.5] add decimals to the hundredths place

Measurement & Data

• Converting Measurement Units — [4.MD.A.1] change from a larger unit to a smaller one
• Measurement Word Problems — [4.MD.A.2] length, weight, volume, and time in real situations
• Area of Rectangles — [4.MD.A.3] length times width — the space inside a rectangle
• Perimeter of Rectangles — [4.MD.A.3] the distance all the way around a rectangle
• Area and Perimeter Word Problems — [4.MD.A.3] decide whether a problem needs area or perimeter
• Line Plots with Fractions — [4.MD.B.4] read and use a line plot of fraction measurements

Angles

• Angles as Fractions of a Circle — [4.MD.C.5] a full turn is 360 degrees — find a fraction of it
• Measuring Angles with a Protractor — [4.MD.C.6] name angles acute, right, or obtuse by their measure
• Drawing Angles with Given Measures — [4.MD.C.6] know what a given degree measure should look like
• Adding and Subtracting Angles — [4.MD.C.7] an angle split into parts — find the missing part

Geometry

• Points, Lines, Rays, and Angles — [4.G.A.1] the building blocks of geometry and how to tell them apart
• Parallel and Perpendicular Lines — [4.G.A.1] lines that never meet, and lines that cross at a square corner
• Classifying Triangles — [4.G.A.2] sort triangles by their angles and their sides
• Classifying Quadrilaterals — [4.G.A.2] name four-sided shapes by their sides and angles
• Lines of Symmetry — [4.G.A.3] find the lines that fold a shape onto itself

How to use these worksheets at home

Short and regular is the whole strategy. A fourth grader works well for about fifteen minutes before focus fades, so plan for one PDF per sitting and stop while it is still going smoothly. Two or three of those a week adds up to real progress over a school year, without the practice ever feeling heavy.

Running related skills next to each other makes the practice feel like a path. Do “Multiplying by One-Digit Numbers,” then “Multiplying by Two-Digit Numbers” — the second is a natural step from the first. Pair “Equivalent Fractions” with “Comparing Fractions,” or “Area of Rectangles” right before “Perimeter of Rectangles.” When skills come in matched pairs, the first worksheet does part of the teaching for the second.

Keep the answer key aside until the work is done, then go through it together. At a table in Dover or in a classroom in Middletown, that review — talking through why an answer holds up — is where the real learning happens.

And when a worksheet goes poorly, treat it as a map rather than a verdict. A rough page on comparing fractions usually points to one step — finding a common denominator, or reasoning about the size of the pieces — that needs another look, not to a child who has lost the topic. Because each PDF stays on one skill, that exact stumble is easy to spot. Hand the same sheet back a few days later; the second attempt is almost always smoother, and watching that happen teaches a child something true about how effort becomes skill.

A note about DeSSA at Grade 4

Delaware fourth graders take the DeSSA Mathematics assessment — the Delaware System of Student Assessments — in the spring. It is built on the Delaware Mathematics Standards, which are aligned to the Common Core, so the skills these worksheets practice and the skills the test measures come from the same source.

The Grade 4 DeSSA asks students to reason, not just compute. They are expected to compare and round large numbers, perform multi-digit multiplication and division, work with factors, multiples, and prime and composite numbers, compare and add fractions, handle the first decimals, and solve multi-step word problems by choosing the right operation. Because each PDF here targets one standard, the collection works as a checklist: find the skill that needs attention, work just that PDF, and leave the strong skills alone.

A short closing

Fourth-grade math is a full year, but it unfolds in order, and a student gets through it one skill at a time. Bookmark this page, print one PDF tonight, and let your child start somewhere small. Delaware kids take on big new things well when the next step is clear — and a worksheet waiting on the table is exactly that.

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