Count to 120

lessonbunny.com

Answer Key & Explanations

Count to 120 · Grade 1 · Worksheet 2

1. What number comes after 109? Answer: 110 Solution: Start at 109. Count forward by one: 109, 110. The number that comes after 109 is 110.
   Full step-by-step solution

   Step 1: Start at 109. Step 2: Count forward by one: 109, 110. Step 3: The number that comes after 109 is 110. The answer is 110.

2. Sophia is counting seashells. Sophia says, 'I have 108 seashells.' Then Sophia finds 3 more. What number comes right after 108 when Sophia counts from 108 to 108 + 3? Answer: 109 Solution: We need to find the next number after 108. When counting forward, the next number is one more. 108 + 1 = 109.
   Full step-by-step solution

   We need to find the next number after 108. When counting forward, the next number is one more. 108 + 1 = 109. So the number that comes after 108 is 109.

3. What number comes after 89? Answer: 90 Solution: Look at the number 89. It has 8 tens and 9 ones. When you count forward by one, you add 1 to the ones place.
   Full step-by-step solution

   Step 1: Look at the number 89. It has 8 tens and 9 ones. Step 2: When you count forward by one, you add 1 to the ones place. 9 ones + 1 one = 10 ones. Step 3: 10 ones is the same as 1 ten. So you add 1 ten to the 8 tens to get 9 tens, and you have 0 ones left. Step 4: 9 tens and 0 ones is the number 90. The answer is 90.

4. Mere is counting seashells. Mere says, 'I have 49 seashells.' Then Mere finds 5 more. What number comes right after 49 when Mere counts from 49 to 49 + 5? Answer: 50 Solution: We need to find the next number after 49. When counting forward, the next number is one more. 49 + 1 = 50.
   Full step-by-step solution

   We need to find the next number after 49. When counting forward, the next number is one more. 49 + 1 = 50. So the number that comes after 49 is 50.

5. Emma is collecting shells at the beach. She finds 12 white shells and 8 brown shells. How many shells does Emma have in total? Answer: 20 Solution: Emma has 12 white shells. Emma has 8 brown shells. Add the white shells and brown shells together: 12 + 8 12 + 8 = 20 Emma has 20 shells in total.
   Full step-by-step solution

   Step 1: Emma has 12 white shells. Step 2: Emma has 8 brown shells. Step 3: Add the white shells and brown shells together: 12 + 8 Step 4: 12 + 8 = 20 Emma has 20 shells in total.

6. There are 10 rows of chairs in the classroom. Each row has 10 chairs. How many chairs are there in total? Answer: 100 Solution: We have 10 rows of chairs, and each row has 10 chairs. We need to find the total number of chairs. Think about what operation to use.
   Full step-by-step solution

   Step 1: Understand the problem. We have 10 rows of chairs, and each row has 10 chairs. We need to find the total number of chairs. Step 2: Think about what operation to use. If each row has the same number of chairs, we can multiply the number of rows by the number of chairs per row. Step 3: Write the multiplication. Number of rows = 10 Chairs per row = 10 Total chairs = 10 × 10 Step 4: Perform the multiplication. 10 × 10 = 100 Step 5: State the final answer. There are 100 chairs in total.

7. 25 + 15 = ? Answer: 40 Solution: Write the problem clearly. 25 + 15 Start by adding the numbers in the ones place (the rightmost digits). The ones digit of 25 is 5.
   Full step-by-step solution

   Let's add 25 and 15 step-by-step. Step 1: Write the problem clearly. 25 + 15 Step 2: Start by adding the numbers in the ones place (the rightmost digits). The ones digit of 25 is 5. The ones digit of 15 is 5. Add them: 5 + 5 = 10. Step 3: Handle the result from Step 2. Since 10 is a two-digit number, we write down the 0 in the ones place of the answer and carry over the 1 to the tens place. Step 4: Now add the numbers in the tens place, including the carry-over. The tens digit of 25 is 2. The tens digit of 15 is 1. Add them: 2 + 1 = 3. Now add the carried-over 1: 3 + 1 = 4. Step 5: Combine the results. The tens place is 4 and the ones place is 0. So the final answer is 40. Therefore, 25 + 15 = 40.