Oregon OSAS Grade 4 Math Free Worksheets: Printable Grade 4 Math Practice with Answer Keys

Math in fourth grade starts to feel less like a set of separate tricks and more like a connected web. A child learns that multiplication and division are two sides of one relationship. They see that a fraction is a kind of division, and that a decimal is just another way to write certain fractions. They notice that area is multiplication wearing a different coat. Fourth grade is the year these threads start tying together — and a student who sees the connections has a far easier time than one memorizing each piece in isolation.

There is plenty to connect. Oregon fourth graders work on place value into the large numbers, multi-digit multiplication and division with remainders, factors and multiples, and number patterns. Fractions get serious: equivalence, comparing, adding and subtracting with like denominators, mixed numbers, and multiplying a fraction by a whole number. Decimals to the hundredths make their first appearance, along with unit conversions, area and perimeter, line plots, and angle measurement. Each topic is manageable; together they ask a child to keep a lot in view at once.

From a school morning in Portland to a quiet afternoon near Eugene, the dependable approach is the same — one skill, practiced until it feels solid, before the next one starts. These worksheets are built to support exactly that.

What’s on this page

This page holds 43 single-skill PDFs, each aligned to the Oregon Mathematics Standards at Grade 4. Every file is focused on one skill alone. A worksheet on multiplying fractions by whole numbers will not also quiz long division; a page on line plots stays with line plots. That focus is intentional — it lets a child complete a page and feel that something is genuinely done.

Each PDF begins with a one-page Quick Review that explains the skill plainly and carries one example through from start to finish. Then come 20 practice problems arranged from easy to hard, so confidence builds before the challenge arrives. Four word problems follow, setting the skill in a situation a fourth grader can picture. The final page is a student-facing answer key with short, warm explanations — the kind a nine- or ten-year-old can read alone and actually 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

Favor short, regular sittings over long, rare ones. A fourth grader who works fifteen focused minutes on one page a few times a week will move further than one who endures a marathon worksheet session every weekend. Kids this age do their clearest thinking in stretches they can finish.

Putting connected skills back to back lets the web show itself. “Multiplying by One-Digit Numbers” and then “Multiplying by Two-Digit Numbers” — the second simply adds a layer, which is obvious when they sit a day apart. “Equivalent Fractions” before “Comparing Fractions” is another good pair, because renaming a fraction is exactly the tool that makes comparing two of them simple. “Area of Rectangles” alongside “Perimeter of Rectangles” helps a child feel, directly, how covering a shape differs from tracing its edge.

Wherever your home is — Salem, Gresham, somewhere quieter off the main road — the habit worth keeping is letting your child check their own work with the answer key after the problems are done. Reading why each answer is right is where the learning lands. Sit nearby, keep it relaxed, and let the explanations carry part of the teaching. And when a page goes badly, treat it as information rather than failure — it simply tells you which skill needs another day. Set it down, return to it later, and praise the corrections as much as the answers that came out right the first time.

A note about OSAS at Grade 4

Oregon students take the Oregon Statewide Assessment System Mathematics test in the spring. It is built on the Oregon Mathematics Standards, so the skills on these worksheets and the skills the test measures come from the same place.

The Grade 4 OSAS asks for more than recall. Students are expected to multiply and divide multi-digit numbers, reason carefully with fractions, solve multi-step word problems, and explain the thinking behind their answers. Because each PDF here is tied to a single standard, the spring testing window becomes a checklist — work through the skills, see clearly which ones need more time, maybe division with remainders or fraction subtraction, and focus your practice right there.

Want everything in one bundle?

If a full, organized program sounds better than managing separate files, the bundle pulls everything together.

Oregon OSAS Grade 4 Math Preparation Bundle — practice-test books, full-length practice tests, and complete answer keys with step-by-step explanations.

A short closing

Fourth-grade math is a web of connected ideas, but a child weaves it one thread at a time. Bookmark this page, print a single PDF tonight, and let your fourth grader start somewhere small. Oregon kids handle real challenges well when the next step is clear — and a worksheet on the table makes that step about as clear as it can be.