Count Within 1000

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Answer Key & Explanations

Count Within 1000 · Grade 2 · Worksheet 1

1. A rectangular garden is divided into 4 equal rows. Each row has 6 flowers. How many flowers are in the garden in total? Answer: 24 Solution: The garden is divided into 4 equal rows. Each row has 6 flowers. We need to find the total number of flowers.
   Full step-by-step solution

   Step 1: Understand the problem. The garden is divided into 4 equal rows. Each row has 6 flowers. We need to find the total number of flowers. Step 2: Determine the operation to use. Since there are 4 rows and each row has the same number of flowers (6), we can multiply the number of rows by the number of flowers per row. Step 3: Perform the multiplication. Number of rows = 4 Flowers per row = 6 Total flowers = 4 × 6 Step 4: Calculate. 4 × 6 = 24 Step 5: State the final answer. There are 24 flowers in the garden in total.

2. Aroha is skip counting by 5s: 735, 740, __, 750 Answer: 745 Solution: Look at the sequence: 735, 740, __, 750 The pattern is skip counting by 5s (adding 5 each time) 735 + 5 = 740 740 + 5 = 745 745 + 5 = 750 The missing number is 745 The answer is 745.
   Full step-by-step solution

   Step 1: Look at the sequence: 735, 740, __, 750 Step 2: The pattern is skip counting by 5s (adding 5 each time) Step 3: 735 + 5 = 740 Step 4: 740 + 5 = 745 Step 5: 745 + 5 = 750 Step 6: The missing number is 745 The answer is 745.

3. Mere is practicing skip counting by 2s. She says: 346, 348, 350, __, 354. What number is missing? Answer: 352 Solution: The pattern is skip counting by 2s, so we add 2 each time. Start at 346. Add 2: 346 + 2 = 348.
   Full step-by-step solution

   Step 1: The pattern is skip counting by 2s, so we add 2 each time. Step 2: Start at 346. Add 2: 346 + 2 = 348. Step 3: Add 2 again: 348 + 2 = 350. Step 4: Add 2 again: 350 + 2 = 352. Step 5: Check: 352 + 2 = 354, which matches the last number given. The missing number is 352.

4. Olivia is practicing skip counting by 5s. She says, 215, 220, 225, __, 235. What number is missing from Olivia's counting? Answer: 230 Solution: Olivia is skip counting by 5s. This means she adds 5 to each number to get the next number. The last number she said was 225.
   Full step-by-step solution

   Step 1: Olivia is skip counting by 5s. This means she adds 5 to each number to get the next number. Step 2: The last number she said was 225. Step 3: Add 5 to 225: 225 + 5 = 230. Step 4: Check: 215, 220, 225, 230, 235. The pattern works. The answer is 230.

5. Skip count by 5s: 785, 790, __, 800 Answer: 795 Solution: Look at the sequence: 785, 790, __, 800 The pattern is skip counting by 5s (adding 5 each time) 785 + 5 = 790 790 + 5 = 795 795 + 5 = 800 The missing number is 795 The answer is 795.
   Full step-by-step solution

   Step 1: Look at the sequence: 785, 790, __, 800 Step 2: The pattern is skip counting by 5s (adding 5 each time) Step 3: 785 + 5 = 790 Step 4: 790 + 5 = 795 Step 5: 795 + 5 = 800 Step 6: The missing number is 795 The answer is 795.

6. Emma's class is collecting cans for recycling. On Monday they collected 56 cans. On Tuesday they collected 48 cans. How many cans did they collect in total? Answer: 104 Solution: Start with Monday's cans: 56 Add Tuesday's cans: 56 + 48 Add the tens: 50 + 40 = 90 Add the ones: 6 + 8 = 14 Combine tens and ones: 90 + 14 = 104 The answer is 104.
   Full step-by-step solution

   Step 1: Start with Monday's cans: 56 Step 2: Add Tuesday's cans: 56 + 48 Step 3: Add the tens: 50 + 40 = 90 Step 4: Add the ones: 6 + 8 = 14 Step 5: Combine tens and ones: 90 + 14 = 104 The answer is 104.

7. A school library has 456 books on one shelf and 327 books on another shelf. How many books are on both shelves? Answer: 783 Solution: Write the numbers vertically: 456 + 327 Add the ones place: 6 + 7 = 13 ones (which is 1 ten and 3 ones) Add the tens place: 5 + 2 = 7 tens, plus the 1 ten from step 2 = 8 tens Add the hundreds place: 4 + 3 = 7 hundreds Combine the results: 7 hundreds + 8 tens + 3 ones = 783 The answer is 783.
   Full step-by-step solution

   Step 1: Write the numbers vertically: 456 + 327 Step 2: Add the ones place: 6 + 7 = 13 ones (which is 1 ten and 3 ones) Step 3: Add the tens place: 5 + 2 = 7 tens, plus the 1 ten from step 2 = 8 tens Step 4: Add the hundreds place: 4 + 3 = 7 hundreds Step 5: Combine the results: 7 hundreds + 8 tens + 3 ones = 783 The answer is 783.

8. What number comes after 789? Answer: 790 Solution: Start with the number 789. To find the number that comes after, count forward by one. 789 + 1 = 790.
   Full step-by-step solution

   Step 1: Start with the number 789. Step 2: To find the number that comes after, count forward by one. Step 3: 789 + 1 = 790. The number that comes after 789 is 790.

9. Skip count by 100s: 350, 450, __, 650 Answer: 550 Solution: Look at the sequence: 350, 450, __, 650 The pattern is skip counting by 100s (adding 100 each time) 350 + 100 = 450 450 + 100 = 550 550 + 100 = 650 The missing number is 550 The answer is 550.
   Full step-by-step solution

   Step 1: Look at the sequence: 350, 450, __, 650 Step 2: The pattern is skip counting by 100s (adding 100 each time) Step 3: 350 + 100 = 450 Step 4: 450 + 100 = 550 Step 5: 550 + 100 = 650 Step 6: The missing number is 550 The answer is 550.

10. A rectangular classroom has desks arranged in 7 rows. Each row has 9 desks. How many desks are in the classroom in total? Answer: 63 Solution: There are 7 rows of desks. Each row has 9 desks. To find the total number of desks, multiply the number of rows by the number of desks in each row: 7 × 9.
    Full step-by-step solution

    Step 1: There are 7 rows of desks. Step 2: Each row has 9 desks. Step 3: To find the total number of desks, multiply the number of rows by the number of desks in each row: 7 × 9. Step 4: 7 × 9 = 63. The answer is 63.