Math · 3rd Grade (8-9)
Math exercises for 3rd Grade (ages 8-9)
In 3rd Grade (ages 8-9), kids strengthen number sense, place value, addition, subtraction, multiplication, fractions, geometry and measurement. The exercises below are curriculum-aligned so you can pick what to practise next.
181 exercises in this hub
What 3rd Grade covers
Third grade widens the number range to 10,000 and expects the written methods to become reliable. Children add and subtract three- and four-digit numbers with regrouping, work through the times tables towards 12 × 12, and meet division with remainders. Fractions become comparable: equivalent fractions, ordering, and adding fractions with the same denominator. Measurement gets more formal with perimeter, area by counting squares, and converting between millimetres, centimetres and metres. Geometry adds angles, parallel and perpendicular lines, and telling the time to the nearest minute. Data work moves to bar charts with real scales and pictograms with keys.
Modules in this year
Where children usually get stuck
Subtracting across zeros
Something like 3,004 − 1,287 defeats children who learned borrowing as a one-step rule, because the borrowing has to travel through two empty columns. It is worth slowing right down here — this single pattern accounts for a large share of subtraction errors at this age.
Bigger denominator, smaller piece
Everything children know about numbers says 8 is more than 4, so 1/8 looking smaller than 1/4 feels wrong. Fraction walls and folded paper strips settle it far more convincingly than being told, because the contradiction is visible.
Not knowing what to do with a remainder
"17 ÷ 5 = 3 remainder 2" is the easy part. Deciding whether the answer to a word problem is 3 buses, 4 buses, or 3.4 depends entirely on context, and that judgement needs practising separately from the calculation.
How to practise at home
- 1
Ten minutes, most days
Short and frequent beats long and occasional, especially for number facts. Ten focused minutes after school, four or five days a week, will do more for a 3rd Grade child's fluency than an hour at the weekend — and it is far easier to keep going.
- 2
Ask for the method, not the answer
"How did you work that out?" is the single most useful question you can ask, and it is worth asking when the answer is right as well as when it is wrong. It shows you whether a correct answer came from understanding or from a lucky guess.
- 3
Use the kitchen and the shop
Doubling a recipe, working out change, reading a scale, timing something — these are the same skills the worksheets cover, with the advantage that they obviously matter. A child who resists a page of sums will often happily work out whether there is enough money.
Prefer it on paper?
Open a free printable worksheet for 3rd Grade, with a full answer key and no account needed.
Featured exercises
Predicting from Data Patterns (Ex. 1)
Level 28 minUnit Fraction of a Set (Ex. 2)
Level 27 minPictograms with Keys (Ex. 3)
Level 28 minTimes Tables: 8s and 10s (Ex. 3)
Level 28 minFractions on a Number Line (Ex. 3)
Level 28 minHorizontal & Vertical Lines (Ex. 2)
Level 28 minAdding & Subtracting Fractions (Ex. 1)
Level 28 minReading Bar Charts (Ex. 1)
Level 28 minHundreds, Tens and Ones (Ex. 3)
Level 28 minMass and Capacity (Ex. 2)
Level 28 minInverse Operations: Check Your Answers (Ex. 2)
Level 28 minArrays and Number Lines (Ex. 2)
Level 28 minTelling Time to the Nearest 5 Minutes (Ex. 3)
Level 28 minInverse Operations: × and ÷ (Ex. 1)
Level 28 minReading and Writing Numbers to 1,000 (Ex. 3)
Level 28 minEstimating Sums and Differences (Ex. 2)
Level 28 minMultiplication & Division Word Problems (Ex. 2)
Level 28 minParallel & Perpendicular Lines (Ex. 1)
Level 28 minInterpreting Charts: Totals & Differences (Ex. 3)
Level 28 minMeasuring Length in cm and m (Ex. 2)
Level 28 min
Common questions
- What maths should a 3rd Grade child know?
- The modules listed on this page are the standard objectives for 3rd Grade (8-9) — they are what most primary curricula expect a child to cover during the year. Children move through them at genuinely different speeds, so treat the list as the shape of the year rather than a checklist with a deadline.
- How much practice is enough?
- For most children at this age, ten to fifteen minutes on most days is plenty. Regularity matters much more than volume: short sessions keep number facts fresh and keep maths from becoming something that only happens when there is a problem.
- Are these exercises free?
- You can browse every module on this page and open a free printable worksheet with an answer key without creating an account. A free account adds the full exercise library, progress tracking, and the ability to assign specific practice to your kids.
- Do these follow the school curriculum?
- The exercises are mapped to standard primary objectives for each year and grouped into the modules shown above. They are written to sit alongside most national curricula rather than to follow one country's exact sequence, so the topics will match even where the ordering differs.