Count Within 1000

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Answer Key & Explanations

Count Within 1000 · Grade 2 · Worksheet 3

1. A rectangular garden is divided into 8 equal rows. Each row has 12 flowers. How many flowers are in the garden in total? Answer: 96 Solution: We have a rectangular garden divided into 8 equal rows. Each row has 12 flowers. We need to find the total number of flowers.
   Full step-by-step solution

   Step 1: Understand the problem. We have a rectangular garden divided into 8 equal rows. Each row has 12 flowers. We need to find the total number of flowers. Step 2: Identify the operation. Since each of the 8 rows has the same number of flowers (12), the total number of flowers is found by multiplying the number of rows by the number of flowers per row. Step 3: Write the multiplication. Total flowers = number of rows × flowers per row Total flowers = 8 × 12 Step 4: Calculate step-by-step. 8 × 12 can be broken down as: 8 × 10 = 80 8 × 2 = 16 Now add: 80 + 16 = 96 Step 5: State the final answer. There are 96 flowers in the garden in total.

2. Skip count by 10s: 581, 591, __, 611 Answer: 601 Solution: Look at the sequence: 581, 591, __, 611 The pattern is skip counting by 10s (adding 10 each time) 581 + 10 = 591 591 + 10 = 601 601 + 10 = 611 The missing number is 601 The answer is 601.
   Full step-by-step solution

   Step 1: Look at the sequence: 581, 591, __, 611 Step 2: The pattern is skip counting by 10s (adding 10 each time) Step 3: 581 + 10 = 591 Step 4: 591 + 10 = 601 Step 5: 601 + 10 = 611 Step 6: The missing number is 601 The answer is 601.

3. Skip count by 5s: 427, 432, __, 442 Answer: 437 Solution: Look at the sequence: 427, 432, __, 442 The pattern is skip counting by 5s (adding 5 each time) 427 + 5 = 432 432 + 5 = 437 437 + 5 = 442 The missing number is 437 The answer is 437.
   Full step-by-step solution

   Step 1: Look at the sequence: 427, 432, __, 442 Step 2: The pattern is skip counting by 5s (adding 5 each time) Step 3: 427 + 5 = 432 Step 4: 432 + 5 = 437 Step 5: 437 + 5 = 442 Step 6: The missing number is 437 The answer is 437.

4. Hana is counting her collection of seashells by skip counting. She says, "124, 126, 128, __, 132." What number is missing from Hana's skip counting pattern? Answer: 130 Solution: Look at the pattern: 124, 126, 128, __, 132. Step 2: Find the difference between the first two numbers: 126 - 124 = 2. Step 3: Check the next pair: 128 - 126 = 2.
   Full step-by-step solution

   Step 1: Look at the pattern: 124, 126, 128, __, 132. Step 2: Find the difference between the first two numbers: 126 - 124 = 2. Step 3: Check the next pair: 128 - 126 = 2. So Hana is skip counting by 2s. Step 4: Add 2 to 128 to find the missing number: 128 + 2 = 130. Step 5: Check: 130 + 2 = 132, which matches the last number. The missing number is 130.

5. A rectangular bookshelf has 4 shelves. Each shelf has 25 books. How many books are on the bookshelf in total? Answer: 100 Solution: The bookshelf has 4 shelves. Each shelf has 25 books. To find the total number of books, add the number of books on each shelf: 25 + 25 + 25 + 25.
   Full step-by-step solution

   Step 1: The bookshelf has 4 shelves. Step 2: Each shelf has 25 books. Step 3: To find the total number of books, add the number of books on each shelf: 25 + 25 + 25 + 25. Step 4: 25 + 25 = 50 Step 5: 50 + 25 = 75 Step 6: 75 + 25 = 100 The answer is 100.

6. Emma's class is collecting books for the school library. On Monday, they collected 56 books. On Tuesday, they collected 43 more books. How many books did Emma's class collect in total? Answer: 99 Solution: Start with the number of books collected on Monday: 56 Add the number of books collected on Tuesday: 43 Add the ones place: 6 + 3 = 9 Add the tens place: 50 + 40 = 90 Combine the results: 90 + 9 = 99 The answer is 99.
   Full step-by-step solution

   Step 1: Start with the number of books collected on Monday: 56 Step 2: Add the number of books collected on Tuesday: 43 Step 3: Add the ones place: 6 + 3 = 9 Step 4: Add the tens place: 50 + 40 = 90 Step 5: Combine the results: 90 + 9 = 99 The answer is 99.

7. Olivia is practicing skip counting by 5s. She says: 415, 420, 425, __, 435. What number did Olivia forget to say? Answer: 430 Solution: Olivia is skip counting by 5s, so each number increases by 5. Step 2: Start at 415. Add 5: 415 + 5 = 420.
   Full step-by-step solution

   Step 1: Olivia is skip counting by 5s, so each number increases by 5. Step 2: Start at 415. Add 5: 415 + 5 = 420. Step 3: Add 5: 420 + 5 = 425. Step 4: Add 5: 425 + 5 = 430. Step 5: Check: 430 + 5 = 435. The missing number is 430.

8. Isabella is counting her collection of colorful buttons. She counts 573 buttons. Then she finds 10 more buttons in her craft box. What number comes after 573 when she continues counting by ones? Answer: 574 Solution: Isabella has 573 buttons. Step 2: She finds 10 more buttons, but the question asks what number comes after 573 when counting by ones, not adding 10. Step 3: When counting by ones, the number after 573 is 574.
   Full step-by-step solution

   Step 1: Isabella has 573 buttons. Step 2: She finds 10 more buttons, but the question asks what number comes after 573 when counting by ones, not adding 10. Step 3: When counting by ones, the number after 573 is 574. Step 4: So the answer is 574.

9. Sophia is practicing skip counting by 5s. She says: 245, 250, 255, __, 265. What number did Sophia forget? Answer: 260 Solution: Look at the pattern: 245, 250, 255, __, 265. Each step adds 5. From 255, add 5: 255 + 5 = 260.
   Full step-by-step solution

   Step 1: Look at the pattern: 245, 250, 255, __, 265. Each step adds 5. Step 2: From 255, add 5: 255 + 5 = 260. Step 3: Check: 260 + 5 = 265, which matches the next number in the sequence. The answer is 260.