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Addition Within 1000

Grade 3 · Mathematics · Worksheet 1

  1. A rectangular garden has 8 rows of flowers. Each row has 7 flowers. How many flowers are there in the garden?
    Answer: ______________
  2. Emma is collecting shells at the beach. On Monday, she found 127 shells. On Tuesday, she found 85 more shells. Then she gave 43 shells to her friend Liam. How many shells does Emma have now? Answer: ______________
  3. Liam's school is collecting cans for recycling. On Monday, they collected 345 cans. On Tuesday, they collected 278 cans. How many cans did they collect in total over the two days? Answer: ______________
  4. Emma collected 378 seashells on Monday and 495 seashells on Tuesday at the beach. How many seashells did she collect in total over the two days? Answer: ______________
  5. Liam collected 125 stickers in his sticker book. His friend Emma gave him 75 more stickers. How many stickers does Liam have now? Answer: ______________
  6. Liam is collecting trading cards. He has 347 cards in his collection. For his birthday, his friend Emma gives him 215 more cards. How many trading cards does Liam have now? Answer: ______________
  7. Liam collected 378 baseball cards. For his birthday, his grandmother gave him 245 more cards. How many baseball cards does Liam have now? Answer: ______________
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Answer Key & Explanations

Addition Within 1000 · Grade 3 · Worksheet 1

  1. A rectangular garden has 8 rows of flowers. Each row has 7 flowers. How many flowers are there in the garden? Answer: 56 Solution: We are told that the garden has 8 rows of flowers, and each row has 7 flowers. Understand what is being asked. We need the total number of flowers.
    Full step-by-step solution

    We are told that the garden has 8 rows of flowers, and each row has 7 flowers. Step 1: Understand what is being asked. We need the total number of flowers. If each row has the same number of flowers, we can multiply the number of rows by the number of flowers in each row. Step 2: Write the multiplication. Number of rows = 8 Flowers per row = 7 Total flowers = 8 × 7 Step 3: Perform the multiplication. 8 × 7 = 56 Step 4: State the final answer. There are 56 flowers in the garden.

  2. Emma is collecting shells at the beach. On Monday, she found 127 shells. On Tuesday, she found 85 more shells. Then she gave 43 shells to her friend Liam. How many shells does Emma have now? Answer: 169 Solution: Emma starts with shells found on Monday. Monday shells = 127 On Tuesday, she found 85 more shells. Total shells after Tuesday = 127 + 85 127 + 85 = 212 She gave 43 shells to Liam.
    Full step-by-step solution

    Let's solve this step by step. Step 1: Emma starts with shells found on Monday. Monday shells = 127 Step 2: On Tuesday, she found 85 more shells. Total shells after Tuesday = 127 + 85 127 + 85 = 212 Step 3: She gave 43 shells to Liam. Shells after giving away = 212 − 43 Step 4: Calculate 212 − 43. 212 − 40 = 172 172 − 3 = 169 So, Emma has 169 shells now.

  3. Liam's school is collecting cans for recycling. On Monday, they collected 345 cans. On Tuesday, they collected 278 cans. How many cans did they collect in total over the two days? Answer: 623 Solution: Write the numbers aligned by place value in your mind. Monday: 345 Tuesday: 278 Add the ones place. 5 ones + 8 ones = 13 ones.
    Full step-by-step solution

    Let's add the number of cans collected on Monday and Tuesday step by step. Step 1: Write the numbers aligned by place value in your mind. Monday: 345 Tuesday: 278 Step 2: Add the ones place. 5 ones + 8 ones = 13 ones. 13 ones = 1 ten and 3 ones. Write down 3 in the ones place, carry over 1 to the tens place. Step 3: Add the tens place, including the carry-over. Tens: 4 (from 345) + 7 (from 278) + 1 (carried over) = 12 tens. 12 tens = 1 hundred and 2 tens. Write down 2 in the tens place, carry over 1 to the hundreds place. Step 4: Add the hundreds place, including the carry-over. Hundreds: 3 (from 345) + 2 (from 278) + 1 (carried over) = 6 hundreds. Write down 6 in the hundreds place. Step 5: Combine the digits from hundreds, tens, and ones. Hundreds: 6, Tens: 2, Ones: 3 So the total is 623. Answer: 623

  4. Emma collected 378 seashells on Monday and 495 seashells on Tuesday at the beach. How many seashells did she collect in total over the two days? Answer: 873 Solution: Identify the numbers to add: 378 and 495. Add the ones place: 8 + 5 = 13. Write down the 3 and carry over the 1 to the tens place.
    Full step-by-step solution

    Step 1: Identify the numbers to add: 378 and 495. Step 2: Add the ones place: 8 + 5 = 13. Write down the 3 and carry over the 1 to the tens place. Step 3: Add the tens place: 7 + 9 + 1 (carried over) = 17. Write down the 7 and carry over the 1 to the hundreds place. Step 4: Add the hundreds place: 3 + 4 + 1 (carried over) = 8. Step 5: Combine the results: 873. The answer is 873.

  5. Liam collected 125 stickers in his sticker book. His friend Emma gave him 75 more stickers. How many stickers does Liam have now? Answer: 200 Solution: Liam starts with 125 stickers. Emma gives him 75 more stickers. To find the total number of stickers Liam has now, we add the stickers he originally had to the stickers Emma gave him.
    Full step-by-step solution

    Liam starts with 125 stickers. Emma gives him 75 more stickers. To find the total number of stickers Liam has now, we add the stickers he originally had to the stickers Emma gave him. Step 1: Write the addition expression. 125 + 75 Step 2: Add the numbers. First, add the ones place: 5 + 5 = 10. Write down 0 in the ones place and carry over 1 to the tens place. Next, add the tens place: 2 + 7 = 9, plus the carried over 1 gives 10. Write down 0 in the tens place and carry over 1 to the hundreds place. Finally, the hundreds place: 1 (carried over) is written in the hundreds place. So, 125 + 75 = 200. Step 3: Interpret the result. Liam now has 200 stickers.

  6. Liam is collecting trading cards. He has 347 cards in his collection. For his birthday, his friend Emma gives him 215 more cards. How many trading cards does Liam have now? Answer: 562 Solution: Liam starts with 347 cards. Emma gives him 215 more cards. 347 + 215 First, add the ones place: 7 + 5 = 12.
    Full step-by-step solution

    Let's solve this step by step. Step 1: Liam starts with 347 cards. Step 2: Emma gives him 215 more cards. Step 3: To find the total, we add the two numbers: 347 + 215 Step 4: First, add the ones place: 7 + 5 = 12. Write down 2 in the ones place, carry over 1 to the tens place. Step 5: Now add the tens place: 4 + 1 = 5, plus the carried over 1 makes 6. Write down 6 in the tens place. Step 6: Now add the hundreds place: 3 + 2 = 5. Write down 5 in the hundreds place. Step 7: The result is 562. So, Liam now has 562 trading cards.

  7. Liam collected 378 baseball cards. For his birthday, his grandmother gave him 245 more cards. How many baseball cards does Liam have now? Answer: 623 Solution: Write the numbers vertically, aligning the place values: 378 + 245 Add the ones place: 8 + 5 = 13 Write down the 3 in the ones place and carry over the 1 to the tens place Add the tens place: 7 + 4 + 1 (carried over) = 12 Write down the 2 in the tens place and carry over the 1 to the hundreds…
    Full step-by-step solution

    Step 1: Write the numbers vertically, aligning the place values: 378 + 245 Step 2: Add the ones place: 8 + 5 = 13 Write down the 3 in the ones place and carry over the 1 to the tens place Step 3: Add the tens place: 7 + 4 + 1 (carried over) = 12 Write down the 2 in the tens place and carry over the 1 to the hundreds place Step 4: Add the hundreds place: 3 + 2 + 1 (carried over) = 6 Write down the 6 in the hundreds place Step 5: The final answer is 623 Liam now has 623 baseball cards.