Year 3 Addition and Subtraction Worksheet - Beginner

Year 3 Addition and Subtraction worksheet for Year 3 (Key Stage 2 / Year 3-6 (Ages 7-11)). Beginner level maths practice, aligned to the UK National Curriculum. Print-ready with answer key included.

Maths•Key Stage 2 / Year 3-6 (Ages 7-11)•Additionbeginner

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Year 3 Addition and Subtraction: Number Detectives

Ages 7–8 • Beginner • UK National Curriculum

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Instructions: Work through the activities in order, using mental strategies where you can and setting out column calculations carefully when needed. Estimate before calculating, then use the inverse operation to check. Write each answer in its box.

Mental Maths: Ones, Tens and Hundreds

Work these out mentally by adding or subtracting the ones, tens or hundreds. Think about place value: for example, adding 30 changes the tens digit. Write each answer in the box.

1. 346 + 7 =

2. 528 - 6 =

3. 271 + 40 =

4. 683 - 50 =

5. 314 + 200 =

6. 759 - 300 =

Column Addition

Set out each calculation in columns, keeping hundreds, tens and ones in the correct places. Add the ones first, then the tens and hundreds, exchanging where needed. Show your working in the box.

1. 246 + 137 =

2. 358 + 224 =

3. 475 + 316 =

4. 189 + 243 =

5. 527 + 168 =

Column Subtraction

Set out each subtraction in columns, lining up the place values. Subtract the ones first and exchange from the next column when needed. Write your answer in the box.

1. 468 - 235 =

2. 572 - 148 =

3. 803 - 276 =

4. 641 - 319 =

5. 700 - 356 =

Estimate, Calculate and Check

For each question, first round both numbers to the nearest 10 and add or subtract to make an estimate. Then calculate the exact answer. Check it using the inverse operation: addition checks subtraction, and subtraction checks addition.

1. 238 + 154: estimate exact answer check:

2. 467 - 182: estimate exact answer check:

3. 326 + 247: estimate exact answer check:

4. 615 - 298: estimate exact answer check:

Find the Missing Number

Use the inverse operation to find the missing number. For example, if a number plus 20 makes 75, subtract 20 from 75. Write the missing number in each box.

1. 236 + ___ = 300

2. ___ - 145 = 230

3. 480 - ___ = 125

4. 317 + ___ = 562

5. ___ + 268 = 700

Addition and Subtraction in Stories

Read each problem and decide whether to add or subtract. You may use a column method for the three-digit numbers. Write the answer, including the unit or object where appropriate.

1. A library has 248 storybooks and buys 135 more. How many storybooks does it have now?

2. A farm picked 563 apples and sold 278. How many apples were left?

3. A school collected 186 cans on Monday and 247 on Tuesday. How many cans did it collect altogether?

4. A coach has 420 seats. There are 356 people on board. How many seats are empty?

5. Mia has saved £275. She needs £400 for a bicycle. How many more pounds does she need?

Answer Key

Activity 1: 353 ; 522 ; 311 ; 633 ; 514 ; 459

Activity 2: 383 ; 582 ; 791 ; 432 ; 695

Activity 3: 233 ; 424 ; 527 ; 322 ; 344

Activity 4: 1. Estimate 390, exact answer 392, check 392 - 154 = 238 ; 2. Estimate 290, exact answer 285, check 285 + 182 = 467 ; 3. Estimate 570, exact answer 573, check 573 - 247 = 326 ; 4. Estimate 320, exact answer 317, check 317 + 298 = 615

Activity 5: 64 ; 375 ; 355 ; 245 ; 432

Activity 6: 383 storybooks ; 285 apples ; 433 cans ; 64 seats ; £125