Free Colorado CMAS Grade 3 Math Practice: 49 Printable PDFs for Classrooms, Tutors, and Parents

Third grade is where math takes a big step up. Multiplication shows up for the first time, fractions become real numbers on a number line, and word problems start asking for two steps instead of one. These shifts reward steady, single-skill practice more than long packets.

These 49 worksheets were built to make third-grade math walkable, one skill at a time. Whether your third grader is in Denver, Colorado Springs, Aurora, or Boulder, each PDF gives them a single idea, a clear example, and enough practice to make it feel ordinary.

What’s on this page

Forty-nine single-skill PDFs, each aligned to the Colorado Mathematics Standards (Common Core-aligned) at Grade 3. Every file does one job. A student practicing multiplication facts is not also being quizzed on area, and a student working through fractions is not getting pulled sideways into time. One skill, one page of practice, one clear focus.

Each PDF opens with a one-page Quick Review that explains the skill in plain language and walks through a fully worked example. Then come around 12 practice problems and 2 word problems that put the skill in a real situation. The last section is a student-facing answer key, not bare answers, but short, friendly explanations a third grader can read alone and actually learn from.

Place Value and Number Sense

• Place Value and the Base-Ten System, [3.NBT.A.1] find the value of every digit in a multi-digit number
• Reading and Writing Whole Numbers, [3.NBT.A.1] switch between standard, expanded, and word forms
• Comparing and Ordering Whole Numbers, [3.NBT.A.1] use <, >, and = to compare numbers up to four digits
• Rounding Whole Numbers, [3.NBT.A.1] round to the nearest ten or hundred
• Even and Odd Numbers, [2.OA.C.3] spot even vs.\ odd by the ones digit

Addition and Subtraction Within 1,000

• Addition Within 1,000, [3.NBT.A.2] regroup with confidence using place-value columns
• Subtraction Within 1,000, [3.NBT.A.2] borrow once or many times, the steps are the same
• Estimating Sums and Differences, [3.NBT.A.1] round first, then add or subtract for a quick check
• Word Problems: Addition and Subtraction, [3.OA.D.8] turn one- and two-step stories into number sentences

Multiplication

• Understanding Multiplication, [3.OA.A.1] \(a \times b\) as equal groups and as an array
• Multiplication Facts and Strategies, [3.OA.C.7] skip-count, double, and the \(\times 9\) trick
• Properties of Multiplication, [3.OA.B.5] commutative, associative, identity, zero, distributive
• Multiplying by Multiples of 10, [3.NBT.A.3] basic fact, then add the zero on the end
• Multiplying Two-Digit by One-Digit, [3.NBT.A.3] break-apart strategy with tens and ones
• Multiplication Word Problems, [3.OA.A.3] equal groups, arrays, and “times as many”

Division

• Understanding Division, [3.OA.A.2] share equally or count groups
• Division Facts and Strategies, [3.OA.C.7] ask the multiplication twin to find each quotient
• Relating Multiplication and Division, [3.OA.B.6] fact families and missing factors
• Division Word Problems, [3.OA.A.3] sharing stories vs.\ grouping stories

Fractions

• Understanding Fractions, [3.NF.A.1] name a fraction by counting equal parts
• Fractions on a Number Line, [3.NF.A.2] find a fraction by jumping along $0$ to $1$
• Equivalent Fractions, [3.NF.A.3] make different fractions that mean the same amount
• Comparing Fractions, [3.NF.A.3.D] same denominator vs.\ same numerator rules
• Whole Numbers as Fractions, [3.NF.A.3.C] write any whole number as a fraction

Patterns and Equations

• Number Patterns and Sequences, [3.OA.D.9] find the rule, then continue the list
• Two-Step Word Problems, [3.OA.D.8] split into Step 1 and Step 2 and write each result
• Unknown Numbers in Equations, [3.OA.A.4] use the inverse operation to find the missing number
• Input-Output Tables, [3.OA.D.9] find the rule that turns input into output

Measurement

• Measuring Length, [3.MD.B.4] inches, feet, yards, centimeters, meters
• Liquid Volume and Mass, [3.MD.A.2] liters, milliliters, grams, kilograms
• Time and Elapsed Time, [3.MD.A.1] count up on a clock to find the gap
• Temperature, [2.MD.D.9] degrees Fahrenheit with rise, drop, and compare
• Money and Making Change, [2.MD.C.8] count coins and find change

Area and Perimeter

• Understanding Area, [3.MD.C.5] count unit squares to find area
• Area of Rectangles, [3.MD.C.7] area \(= \) length \(\times\) width
• Perimeter of Polygons, [3.MD.D.8] add up every side length
• Area and Perimeter of Composite Figures, [3.MD.C.7.D] break into rectangles, then add

Geometry

• Classifying Two-Dimensional Shapes, [3.G.A.1] name polygons by the number of sides
• Classifying Quadrilaterals, [3.G.A.1] squares, rectangles, rhombuses, trapezoids
• Points, Lines, Line Segments, and Rays, [4.G.A.1] the four building blocks of geometry
• Parallel and Perpendicular Lines, [4.G.A.1] side-by-side vs.\ \(90^{\circ}\) crossing
• Classifying Angles, [4.G.A.1] right, acute, obtuse, and straight
• Lines of Symmetry, [4.G.A.3] find the fold lines that match a shape
• Three-Dimensional Shapes, [K.G.A.3] count faces, edges, and vertices
• Partitioning Shapes Into Equal Parts, [3.G.A.2] split into halves, thirds, fourths, and beyond

Data

• Pictographs and Bar Graphs, [3.MD.B.3] read graph values and compare categories
• Line Plots, [3.MD.B.4] find mode, range, and total from the Xs
• Probability and Chance, [7.SP.C.5] label events impossible, unlikely, equally likely, likely, certain

Personal Financial Literacy

• Personal Financial Literacy, [, ] earn, save, spend, and figure how long it takes

How to use these worksheets at home

The trick with third-grade math is sequence. Skills here build on each other in tight families. Try Understanding Multiplication before Multiplication Facts and Strategies, once the picture of “equal groups” is solid, the facts feel like a shortcut rather than a list to memorize. Do Equivalent Fractions before Comparing Fractions; once your child knows that \(\tfrac{2}{4}\) and \(\tfrac{1}{2}\) name the same amount, comparing is much easier.

Keep the sessions short. Most of these PDFs take ten or fifteen minutes, which is about as long as a third grader’s full attention lasts on a school night. Two afternoons a week, done steadily, will move a student further than a long Saturday session that nobody enjoys. Let them keep a pencil and scratch paper handy and resist the urge to correct mid-problem, the answer key is there for after.

One more habit worth building: when a worksheet goes well, do the next skill in the same family the following session, while the idea is still warm. When one goes badly, don’t pile on, set it aside and come back to that single page in a few days. Practice doesn’t have to be perfect to be useful; it just has to keep happening.

A note about CMAS at Grade 3

Colorado students take Colorado Measures of Academic Success, Mathematics in spring. CMAS is built on the Colorado Mathematics Standards (Common Core-aligned), the same framework these worksheets are aligned to, so the skills your student practices here and the skills the test asks about come from one source.

At Grade 3, CMAS expects students to fluently add and subtract within \(1{,}000\), multiply and divide within $100$, understand fractions as numbers on a number line, tell and solve elapsed time problems, find the area and perimeter of rectangles, classify two-dimensional shapes, and read pictographs and bar graphs. Because each PDF on this page targets exactly one of those skills, the testing window doubles as a checklist.

A short closing

Third-grade math is a year of new ideas, but it is not a year a student has to face all at once. Bookmark this page, print one PDF tonight, and let your third grader start with a single skill. Colorado kids handle hard things well when the next step is clear — and a worksheet on the table is about as clear as it gets.

Best Bundle to Ace the Colorado CMAS Grade 3 Math Test

Want the fastest path through Colorado CMAS Grade 3 math? This bundle pulls it together, practice-test books, full-length practice tests, and complete step-by-step answer keys, instant PDF download.

Colorado CMAS Grade 3 Math Made Ridiculously Simple

Download

$27.99 Original price was: $27.99.$17.99Current price is: $17.99.

Recommended EffortlessMath Books

For a workbook to use alongside these printable practice pages, Mastering Grade 3 Math covers every third-grade topic with worked examples and plenty of practice. For the multi-step word problems that trip up most third graders, see Mastering Grade 3 Math Word Problems.

Frequently Asked Questions

Is there a free CMAS practice test?

Yes. The Colorado Department of Education links to free CMAS practice resources, including online practice tests that show the question formats and tools third graders will use. Check the CDE assessment pages for the current versions. Once your child is comfortable with the format, single-skill worksheets on multiplication, fractions and area are a good way to fix the gaps a practice test reveals.

What is the CMAS math test for 3rd grade in Colorado?

CMAS is Colorado’s state assessment, and grade 3 is the first year students take it in math. It is given in the spring and checks the grade 3 Colorado Academic Standards: multiplication and division within 100, place value, fractions, area and perimeter, time and measurement. Calculators are not allowed at this grade, so fact fluency and pencil work matter.

Where can I find grade 3 fractions worksheets PDF with answers?

Several of the 49 free Colorado Grade 3 worksheets here focus on fractions, and each PDF ends with a step-by-step answer key written for a third grader to read. They cover unit fractions, fractions on a number line, equivalent fractions and comparing fractions. Print one, work it together, then use the key to talk through any mistakes.

What fractions do 3rd graders learn?

Third graders learn unit fractions like 1/3 and build others from them, so 2/3 is two pieces of size 1/3. They place fractions on a number line, find simple equivalents such as 1/2 = 2/4, and write whole numbers as fractions, like 3 = 3/1. They also compare fractions with the same numerator or denominator, for example 3/8 < 3/4.

Related EffortlessMath Lessons

If a topic on this page feels rusty, these short lessons go deeper:

• How to multiply and divide within 100
• Place value to the thousands
• Adding and subtracting fractions
• How to find area of a rectangle
• How to solve word problems