Class 3 Mathematics
Addition and Subtraction Worksheet for Class 3 with Quiz and Activities
Add and subtract 3-digit numbers using place value, find missing numbers, add more than two numbers and solve word problems. Use the Addition and Subtraction worksheet for Class 3, then play the Addition and Subtraction Class 3 quiz and Addition and Subtraction Class 3 activities online.
Explore WitKnowLearn’s addition and subtraction worksheet for Class 3 with a free online quiz and online activities. Build sums with base ten blocks and trade ten ones for one ten, jump along a number line, open digit locks, flash numbers to add in your head, duel two sums to find the bigger answer and catch the slip in worked solutions. Every activity is a game you can tap.
Addition and Subtraction Class 3 Quiz: Online Quiz
What is 70 + 20?
Addition and Subtraction Class 3 Activities: Online Games
Place Value Explorer
Play first. Spin the digits of two numbers. Pick add or subtract. Watch the blocks and the steps.
247 + 135 = 382
- Ones: 7 + 5 = 12. Write 2 and carry 1 ten.
- Tens: 4 + 3 + 1 = 8.
- Hundreds: 2 + 1 = 3.
Now try the 15 activities
Bubble Pop
Game 1 of 5Goal: Pop the bubble with the right answer.
How to play: Read the sum. Tap the bubble with the answer.
Round 1 of 5: Pop the bubble with the answer to 40 + 30.
Addition and Subtraction Class 3 Complete Guide
This guide supports the addition and subtraction worksheet for Class 3 on this page. It covers adding and subtracting 3-digit numbers using place value, carrying in addition, regrouping in subtraction, finding the missing number in subtraction, adding and subtracting more than two numbers, mental maths addition and subtraction, number patterns and number puzzles, word problems and higher order thinking questions. It follows the Class 3 maths addition and subtraction chapters taught in CBSE and NCERT style classrooms. Use it with the printable addition and subtraction worksheets for Class 3, the Addition and Subtraction Class 3 quiz and the 15 Addition and Subtraction Class 3 activities above.
Addition and Subtraction Class 3 resources on this page
- Addition and subtraction worksheet for Class 3: printable worksheets on 3-digit addition, 3-digit subtraction, missing numbers, mental maths, number puzzles and word problems.
- Addition and Subtraction Class 3 quiz: a free 20-question online quiz with easy, average and thinking questions, block diagrams and instant marks.
- Addition and Subtraction Class 3 activities: 15 free online activities, made of 5 games, 5 workshops and 5 challenges, with marks and a comment after the challenges.
- 3-digit addition and subtraction practice: place value, carrying and regrouping in one place.
Place value: the key to every sum
A 3-digit number is made of hundreds, tens and ones. In 468 there are 4 hundreds, 6 tens and 8 ones, so 468 = 400 + 60 + 8. When you add or subtract, always line up hundreds under hundreds, tens under tens and ones under ones.
Adding 3-digit numbers
Add the ones first. If the ones make 10 or more, write the ones digit and carry 1 ten to the tens column. Do the same with the tens. For 346 + 278: ones 6 + 8 = 14, write 4 and carry 1. Tens 4 + 7 + 1 = 12, write 2 and carry 1. Hundreds 3 + 2 + 1 = 6. The sum is 624.
Subtracting 3-digit numbers
Subtract the ones first. If the top digit is smaller than the bottom digit, regroup. Take 1 ten from the tens column and make it 10 ones. For 503 − 168 you must regroup twice because there are 0 tens. Break 1 hundred into 10 tens, then break 1 ten into 10 ones. The difference is 335.
Finding the missing number in subtraction
Use the opposite operation. If 512 − __ = 247, the missing number is 512 − 247 = 265. If __ − 168 = 275, the missing number is 275 + 168 = 443. Always check by putting the number back into the sum.
Adding and subtracting more than two numbers
Work from left to right, or add the numbers that are easy to join first. For 125 + 238 + 76, add 125 + 238 = 363 and then 363 + 76 = 439. For 500 − 135 − 87 take the numbers away one at a time to get 278.
Mental maths tricks
- Add tens and hundreds first: 345 + 20 = 365.
- Make a friendly number: 199 + 46 is 200 + 46 − 1 = 245.
- Number partners: 35 + 65 = 100 and 250 + 750 = 1000.
- Doubles: 150 + 150 = 300.
- Count back: 700 − 200 = 500 by counting back 2 hundreds.
Number line jumps
Draw a number line and jump forward to add or backward to subtract. Start at 350. Jump 200 forward to 550, then 50 back to 500. Number line jumps show why sums work.
Estimating to check an answer
Round each number to the nearest ten or hundred to check if an answer is sensible. 346 + 278 is about 350 + 280 = 630, so an answer of 624 is sensible and 514 is not.
Word problems and higher order thinking
Read the story twice. Circle the numbers. Decide if each number makes the total go up (words like joined, got, more, in all) or go down (words like left, gave, got off, fewer). Write the number sentence, solve it and write the answer with its unit. Higher order thinking and Olympiad style questions often need two steps, such as 856 − 129 + 74.
Number puzzles
Number puzzles ask you to find numbers that fit a rule, such as picking numbers that add up to a total or finding the missing number in a magic sum. Try one number at a time and check the total.
Solved examples
Common mistakes
| Mistake | Correction |
|---|---|
| Forgetting to add the carried 1 | Write the carry above the next column and add it. |
| Taking the smaller digit from the bigger digit, such as 0 − 5 = 5 | Regroup. You cannot take 5 from 0. |
| Not lining up the places | Put hundreds under hundreds, tens under tens and ones under ones. |
| Regrouping but forgetting to reduce the next digit by 1 | When you take 1 ten, the tens digit goes down by 1. |
| Adding when the story says left or gave | Look for words that mean take away. |
| Not checking the answer | Add the answer to the smaller number to see if you get the bigger number. |
Addition and subtraction in daily life
We add and subtract when we count change, keep score in a game, track how many pages are left in a book, share sweets and plan a trip. Ask your child to work out totals and differences at home and explain each step aloud.
What your child learns from the addition and subtraction worksheet for Class 3, the Addition and Subtraction Class 3 quiz and Addition and Subtraction Class 3 activities
- Adding and subtracting 3-digit numbers with place value
- Carrying and regrouping
- Finding missing numbers
- Adding more than two numbers
- Mental maths and number partners
- Number line jumps
- Estimating and checking answers
- Word problems and number puzzles
Tips for parents and teachers
Use base ten blocks, bundles of sticks or paper money to show regrouping. Ask your child to explain each step aloud. Use the printable PDF worksheets for written practice and the online activities for quick revision. Revisit the common mistakes table when you see the same error twice.
Related Maths Worksheets
- Multiplication worksheets for Class 3Times tables
- Mental Maths worksheet for Class 3Quick sums
- Addition and Subtraction word problems for Class 3Story problems
- Place Value Class 3 worksheet with online activities and quizTens and ones
- Equal Sharing and Equal Regrouping worksheet for Class 3Division basics
- Division Word Problems worksheet for Class 3Sharing stories
- Money Addition and Subtraction worksheet for Class 3Money sums
- Measurement of Weight worksheet for Class 3Grams and kilograms
- Give and Take Class 3 worksheetsAdd and subtract
- Play with Patterns Class 3 worksheetNumber patterns
- Fractions Class 3 worksheet with online activities and quizEqual parts
- Data Handling Class 3 worksheet with online activities and quizRead charts
Frequently Asked Questions
What is the difference between a sum and a difference?
A sum is the answer to an addition and a difference is the answer to a subtraction. In 346 + 278 = 624 the sum is 624. In 503 − 168 = 335 the difference is 335.
How do I add 3-digit numbers with carrying?
Add the ones first. If they make 10 or more, write the ones digit and carry 1 ten to the tens column. Do the same for the tens and then add the hundreds.
How do I subtract 3-digit numbers with regrouping?
If the top digit is smaller than the bottom digit, take 1 from the next column to the left and make it 10 in the column you are working on. Then subtract.
How do I subtract when there is a zero in the tens place?
Break 1 hundred into 10 tens first. Then break 1 of those tens into 10 ones. For example, in 503 − 168 you get 4 hundreds, 9 tens and 13 ones.
How do I find the missing number in a subtraction?
Use the opposite operation. If 512 − __ = 247, find 512 − 247 = 265. If __ − 168 = 275, find 275 + 168 = 443.
How do I add three numbers?
Add the first two numbers, then add the third number to the result. You can also join the numbers that are easy to add first, such as 75 + 25.
How can I check my answer?
Use the opposite operation. Add the difference to the smaller number to get the bigger number. Subtract one number from the sum to get the other number.
What is a quick way to add 99 or 199 in my head?
Add 100 or 200 and then take away 1. For example, 346 + 99 = 346 + 100 − 1 = 445.
Why is place value important in addition and subtraction?
Place value tells you which digits belong together. You add ones to ones, tens to tens and hundreds to hundreds so that every digit has the right value.
How do I know whether to add or subtract in a word problem?
Look for words. Words like joined, got and in all mean add. Words like left, gave away and got off mean subtract. Draw a picture to be sure.
What are higher order thinking questions in maths?
They are questions that need more than one step or some reasoning, such as finding a missing number in a story, spotting a mistake or choosing the bigger answer without a full calculation.
What is included on this addition and subtraction page for Class 3?
This page has printable addition and subtraction worksheets for Class 3, a 20-question Addition and Subtraction Class 3 quiz and 15 Addition and Subtraction Class 3 activities online. The activities include a place value explorer, block builder, digit lock, flash add, bigger answer, spot the slip and challenge marks with a comment.
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