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Addition Within 100

Grade 2 · Mathematics · Worksheet 1

  1. 49 + 36 = ? Answer: ______________
  2. 78 + ___ = 100 Answer: ______________
  3. Mrs. Johnson's class collected 47 cans for recycling. The next day, they collected 35 more cans. How many cans did they collect in total? Answer: ______________
  4. 45 + 28 = ? Answer: ______________
  5. Olivia is arranging 45 stickers in rows on a page. She places 25 stickers in the first row. How many stickers does she need to put in the second row to use all her stickers? Answer: ______________
  6. Liam collected 48 seashells at the beach in the morning. In the afternoon, he found 25 more seashells. How many seashells did Liam collect in total? Answer: ______________
  7. A farmer plants apple trees in rows. There are 8 rows with 6 trees in each row. How many apple trees does the farmer plant in total?
    Answer: ______________
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Answer Key & Explanations

Addition Within 100 · Grade 2 · Worksheet 1

  1. 49 + 36 = ? Answer: 85 Solution: 49 + 36 Add the ones column: 9 + 6 = 15 Write down the 5 in the ones place and carry over the 1 to the tens column Add the tens column: 4 + 3 + 1 (carried over) = 8 Combine the results: 85 The answer is 85.
    Full step-by-step solution

    Step 1: Write the problem vertically: 49 + 36 ----- Step 2: Add the ones column: 9 + 6 = 15 Step 3: Write down the 5 in the ones place and carry over the 1 to the tens column Step 4: Add the tens column: 4 + 3 + 1 (carried over) = 8 Step 5: Combine the results: 85 The answer is 85.

  2. 78 + ___ = 100 Answer: 22 Solution: Start with the equation: 78 + ___ = 100 To find the missing number, subtract 78 from 100 100 - 78 = 22 Check: 78 + 22 = 100 The answer is 22.
    Full step-by-step solution

    Step 1: Start with the equation: 78 + ___ = 100 Step 2: To find the missing number, subtract 78 from 100 Step 3: 100 - 78 = 22 Step 4: Check: 78 + 22 = 100 The answer is 22.

  3. Mrs. Johnson's class collected 47 cans for recycling. The next day, they collected 35 more cans. How many cans did they collect in total? Answer: 82 Solution: Write the numbers vertically: 47 + 35 Add the ones column: 7 + 5 = 12 Write down the 2 in the ones place and carry the 1 to the tens place Add the tens column: 4 + 3 + 1 (carried) = 8 Combine the tens and ones: 80 + 2 = 82 The answer is 82.
    Full step-by-step solution

    Step 1: Write the numbers vertically: 47 + 35 Step 2: Add the ones column: 7 + 5 = 12 Step 3: Write down the 2 in the ones place and carry the 1 to the tens place Step 4: Add the tens column: 4 + 3 + 1 (carried) = 8 Step 5: Combine the tens and ones: 80 + 2 = 82 The answer is 82.

  4. 45 + 28 = ? Answer: 73 Solution: Write the numbers vertically in your mind, aligning them by place value. 45 + 28 Start by adding the digits in the ones place. 5 (from 45) + 8 (from 28) = 13.
    Full step-by-step solution

    Let's add 45 and 28 step by step. Step 1: Write the numbers vertically in your mind, aligning them by place value. 45 + 28 Step 2: Start by adding the digits in the ones place. 5 (from 45) + 8 (from 28) = 13. Step 3: Since 13 is a two-digit number, we separate it into 10 and 3. Write down the 3 in the ones place of the answer, and carry over the 10 (which is 1 ten) to the tens place. Step 4: Now add the digits in the tens place, including the carried-over ten. 4 (from 45) + 2 (from 28) + 1 (carried over) = 7. Step 5: Write the 7 in the tens place of the answer. Step 6: Combine the tens and ones digits: 7 tens and 3 ones makes 73. Therefore, 45 + 28 = 73.

  5. Olivia is arranging 45 stickers in rows on a page. She places 25 stickers in the first row. How many stickers does she need to put in the second row to use all her stickers? Answer: 20 Solution: Olivia has 45 stickers total. She puts 25 stickers in the first row. To find how many are left for the second row, subtract: 45 - 25 = 20.
    Full step-by-step solution

    Step 1: Olivia has 45 stickers total. Step 2: She puts 25 stickers in the first row. Step 3: To find how many are left for the second row, subtract: 45 - 25 = 20. Step 4: Olivia needs 20 stickers in the second row. The answer is 20.

  6. Liam collected 48 seashells at the beach in the morning. In the afternoon, he found 25 more seashells. How many seashells did Liam collect in total? Answer: 73 Solution: Liam started with 48 seashells He found 25 more seashells Add the seashells together: 48 + 25 Add the ones place: 8 + 5 = 13 (write down 3, carry over 1 to the tens place) Add the tens place: 4 + 2 + 1 = 7 Combine the tens and ones: 70 + 3 = 73 The answer is 73.
    Full step-by-step solution

    Step 1: Liam started with 48 seashells Step 2: He found 25 more seashells Step 3: Add the seashells together: 48 + 25 Step 4: Add the ones place: 8 + 5 = 13 (write down 3, carry over 1 to the tens place) Step 5: Add the tens place: 4 + 2 + 1 = 7 Step 6: Combine the tens and ones: 70 + 3 = 73 The answer is 73.

  7. A farmer plants apple trees in rows. There are 8 rows with 6 trees in each row. How many apple trees does the farmer plant in total? Answer: 48 Solution: The farmer has 8 rows of apple trees Each row has 6 trees To find the total number of trees, multiply the number of rows by the number of trees in each row 8 × 6 = 48 The farmer plants 48 apple trees in total
    Full step-by-step solution

    Step 1: The farmer has 8 rows of apple trees Step 2: Each row has 6 trees Step 3: To find the total number of trees, multiply the number of rows by the number of trees in each row Step 4: 8 × 6 = 48 Step 5: The farmer plants 48 apple trees in total