Addition Within 100

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Answer Key & Explanations

Addition Within 100 · Grade 2 · Worksheet 3

1. 76 + 24 = ? Answer: 100 Solution: 76 + 24 Add the ones column: 6 + 4 = 10 Write down the 0 in the ones place and carry over the 1 to the tens column Add the tens column: 7 + 2 + 1 (carried over) = 10 Write down the 10 in the tens and hundreds places Combine the results: 100 The answer is 100.
   Full step-by-step solution

   Step 1: Write the problem vertically: 76 + 24 ----- Step 2: Add the ones column: 6 + 4 = 10 Step 3: Write down the 0 in the ones place and carry over the 1 to the tens column Step 4: Add the tens column: 7 + 2 + 1 (carried over) = 10 Step 5: Write down the 10 in the tens and hundreds places Step 6: Combine the results: 100 The answer is 100.

2. 76 + 19 = ? Answer: 95 Solution: 76 + 19 Add the ones column: 6 + 9 = 15 Write down the 5 in the ones place and carry over the 1 to the tens column Add the tens column: 7 + 1 + 1 (carried over) = 9 Combine the results: 95 The answer is 95.
   Full step-by-step solution

   Step 1: Write the problem vertically: 76 + 19 ----- Step 2: Add the ones column: 6 + 9 = 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: 7 + 1 + 1 (carried over) = 9 Step 5: Combine the results: 95 The answer is 95.

3. Mrs. Johnson's class has 28 students. 15 more students join the class for a special activity. How many students are in the class now? Answer: 43 Solution: Start with the original number of students: 28 Add the new students who joined: 15 Add the ones place first: 8 + 5 = 13 (write down 3, carry over 1) Add the tens place: 2 + 1 + 1 (carried over) = 4 Combine the tens and ones: 40 + 3 = 43 The answer is 43.
   Full step-by-step solution

   Step 1: Start with the original number of students: 28 Step 2: Add the new students who joined: 15 Step 3: Add the ones place first: 8 + 5 = 13 (write down 3, carry over 1) Step 4: Add the tens place: 2 + 1 + 1 (carried over) = 4 Step 5: Combine the tens and ones: 40 + 3 = 43 The answer is 43.

4. A rectangular garden is divided into 4 equal sections. Each section has 12 tomato plants arranged in 3 rows with the same number of plants in each row. How many tomato plants are in each row of one section? Answer: 4 Solution: Each section has 12 tomato plants total The plants are arranged in 3 rows with equal numbers in each row To find plants per row, divide total plants by number of rows: 12 ÷ 3 12 ÷ 3 = 4 The answer is 4.
   Full step-by-step solution

   Step 1: Each section has 12 tomato plants total Step 2: The plants are arranged in 3 rows with equal numbers in each row Step 3: To find plants per row, divide total plants by number of rows: 12 ÷ 3 Step 4: 12 ÷ 3 = 4 The answer is 4.

5. Liam collected 37 seashells at the beach in the morning. In the afternoon, he found 25 more seashells. How many seashells did Liam collect in total? Answer: 62 Solution: Liam collected seashells in two parts: 37 in the morning and 25 in the afternoon. We need to find the total number. Write the addition expression.
   Full step-by-step solution

   Step 1: Understand the problem. Liam collected seashells in two parts: 37 in the morning and 25 in the afternoon. We need to find the total number. Step 2: Write the addition expression. Total seashells = seashells from morning + seashells from afternoon Total seashells = 37 + 25 Step 3: Add the numbers. First, add the ones place: 7 + 5 = 12. Write down 2 in the ones place and carry over 1 to the tens place. Step 4: Add the tens place. Tens place: 3 + 2 = 5, plus the carried over 1 makes 6. So the tens place is 6. Step 5: Combine the digits. The tens place is 6 and the ones place is 2, so the total is 62. Step 6: State the final answer. Liam collected 62 seashells in total.

6. Liam collected 36 seashells at the beach in the morning. In the afternoon, he found 28 more seashells. How many seashells did Liam collect in total? Answer: 64 Solution: Identify the number of seashells collected in the morning. Liam collected 36 seashells in the morning. Identify the number of seashells collected in the afternoon.
   Full step-by-step solution

   Let's solve this step by step. Step 1: Identify the number of seashells collected in the morning. Liam collected 36 seashells in the morning. Step 2: Identify the number of seashells collected in the afternoon. In the afternoon, he found 28 more seashells. Step 3: To find the total, we add the seashells from the morning and the afternoon. Total seashells = 36 + 28 Step 4: Perform the addition. First, add the ones place: 6 + 8 = 14. Write down 4 in the ones place, and carry over 1 to the tens place. Next, add the tens place: 3 + 2 + 1 (carry over) = 6. So, 36 + 28 = 64. Step 5: Conclusion. Liam collected 64 seashells in total.

7. Liam has 38 baseball cards. His friend Noah gives him 25 more baseball cards for his birthday. How many baseball cards does Liam have now? Answer: 63 Solution: Liam starts with 38 baseball cards Noah gives him 25 more baseball cards Add the ones place: 8 + 5 = 13 (write down 3, carry over 1 to the tens place) Add the tens place: 3 + 2 + 1 (carried over) = 6 Combine the tens and ones: 60 + 3 = 63 Liam now has 63 baseball cards.
   Full step-by-step solution

   Step 1: Liam starts with 38 baseball cards Step 2: Noah gives him 25 more baseball cards Step 3: Add the ones place: 8 + 5 = 13 (write down 3, carry over 1 to the tens place) Step 4: Add the tens place: 3 + 2 + 1 (carried over) = 6 Step 5: Combine the tens and ones: 60 + 3 = 63 Liam now has 63 baseball cards.

8. 35 + 45 = ? Answer: 80 Solution: 35 + 45 Add the ones column: 5 + 5 = 10 Write down the 0 in the ones place and carry over the 1 to the tens column Add the tens column: 3 + 4 + 1 (carried over) = 8 Combine the results: 80 The answer is 80.
   Full step-by-step solution

   Step 1: Write the problem vertically: 35 + 45 ----- Step 2: Add the ones column: 5 + 5 = 10 Step 3: Write down the 0 in the ones place and carry over the 1 to the tens column Step 4: Add the tens column: 3 + 4 + 1 (carried over) = 8 Step 5: Combine the results: 80 The answer is 80.

9. A farmer has 57 apples in one basket and 38 apples in another basket. How many apples does the farmer have in total? Answer: 95 Solution: Identify the number of apples in each basket. Basket 1: 57 apples Basket 2: 38 apples Write the addition problem. 57 + 38 Add the ones place first.
   Full step-by-step solution

   Let's add the apples step by step. Step 1: Identify the number of apples in each basket. Basket 1: 57 apples Basket 2: 38 apples Step 2: Write the addition problem. 57 + 38 Step 3: Add the ones place first. 7 ones + 8 ones = 15 ones 15 ones = 1 ten and 5 ones Write down the 5 in the ones place, and carry over the 1 ten to the tens place. Step 4: Add the tens place, including the carry-over. Tens place: 5 (from 57) + 3 (from 38) + 1 (carried over) = 5 + 3 + 1 = 9 tens. Step 5: Combine the tens and ones. 9 tens and 5 ones = 95. Step 6: Conclusion. The farmer has 95 apples in total.