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Add Multiples of 10

Grade 1 · Mathematics · Worksheet 2

  1. Noah has 40 toy cars in his collection. For his birthday, his grandma gives him 50 more toy cars. How many toy cars does Noah have now? Answer: ______________
  2. 30 + 40 = ? Answer: ______________
  3. There are 4 rows of chairs in the classroom. Each row has 10 chairs. How many chairs are there in total?
    Answer: ______________
  4. Aroha picked 20 flowers from the garden in the morning and 50 flowers in the afternoon. How many flowers did Aroha pick altogether? Answer: ______________
  5. Emma has 40 crayons in her art box. Her friend Noah gives her 50 more crayons for her birthday. How many crayons does Emma have now? Answer: ______________
  6. A triangle has 3 sides. One side is 10 units long, another side is 20 units long, and the third side is 30 units long. What is the total length of all three sides? Answer: ______________
  7. Ben had 10 crayons. Ben's teacher gave Ben 10 more crayons for a project. How many crayons does Ben have now? Answer: ______________
  8. Ethan is collecting toy cars. Ethan has 60 toy cars in a box and 20 toy cars on a shelf. How many toy cars does Ethan have in total? Answer: ______________
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Answer Key & Explanations

Add Multiples of 10 · Grade 1 · Worksheet 2

  1. Noah has 40 toy cars in his collection. For his birthday, his grandma gives him 50 more toy cars. How many toy cars does Noah have now? Answer: 90 Solution: Noah starts with 40 toy cars He gets 50 more toy cars Add the two amounts: 40 + 50 40 + 50 = 90 The answer is 90.
    Full step-by-step solution

    Step 1: Noah starts with 40 toy cars Step 2: He gets 50 more toy cars Step 3: Add the two amounts: 40 + 50 Step 4: 40 + 50 = 90 The answer is 90.

  2. 30 + 40 = ? Answer: 70 Solution: Identify the numbers to be added. We have 30 and 40. Add the numbers in the ones place first.
    Full step-by-step solution

    Step 1: Identify the numbers to be added. We have 30 and 40. Step 2: Add the numbers in the ones place first. The number 30 has a 0 in the ones place. The number 40 also has a 0 in the ones place. 0 + 0 = 0 So, the ones digit of our answer is 0. Step 3: Add the numbers in the tens place. The number 30 has a 3 in the tens place, which represents 3 tens, or 30. The number 40 has a 4 in the tens place, which represents 4 tens, or 40. 3 tens + 4 tens = 7 tens, or 70. Step 4: Combine the results from the tens and ones places. From Step 3, we have 7 tens (70). From Step 2, we have 0 ones (0). 70 + 0 = 70. Step 5: State the final answer. Therefore, 30 + 40 = 70.

  3. There are 4 rows of chairs in the classroom. Each row has 10 chairs. How many chairs are there in total? Answer: 40 Solution: We have 4 rows of chairs, and each row has 10 chairs. We need to find the total number of chairs. Decide on the operation.
    Full step-by-step solution

    Step 1: Understand the problem. We have 4 rows of chairs, and each row has 10 chairs. We need to find the total number of chairs. Step 2: Decide on the operation. Since each row has the same number of chairs, we can use multiplication to find the total quickly. Total chairs = number of rows × chairs per row. Step 3: Perform the multiplication. Number of rows = 4 Chairs per row = 10 So, total chairs = 4 × 10. Step 4: Calculate. 4 × 10 = 40. Step 5: State the final answer. There are 40 chairs in total.

  4. Aroha picked 20 flowers from the garden in the morning and 50 flowers in the afternoon. How many flowers did Aroha pick altogether? Answer: 70 Solution: Aroha picks 20 flowers in the morning. Aroha picks 50 flowers in the afternoon. Add the two amounts: 20 + 50 = 70.
    Full step-by-step solution

    Step 1: Aroha picks 20 flowers in the morning. Step 2: Aroha picks 50 flowers in the afternoon. Step 3: Add the two amounts: 20 + 50 = 70. Aroha picked 70 flowers altogether.

  5. Emma has 40 crayons in her art box. Her friend Noah gives her 50 more crayons for her birthday. How many crayons does Emma have now? Answer: 90 Solution: Emma starts with 40 crayons Noah gives her 50 more crayons Add the two amounts together: 40 + 50 40 + 50 = 90 Emma has 90 crayons in total.
    Full step-by-step solution

    Step 1: Emma starts with 40 crayons Step 2: Noah gives her 50 more crayons Step 3: Add the two amounts together: 40 + 50 Step 4: 40 + 50 = 90 Emma has 90 crayons in total.

  6. A triangle has 3 sides. One side is 10 units long, another side is 20 units long, and the third side is 30 units long. What is the total length of all three sides? Answer: 60 Solution: Identify the lengths of the three sides: 10, 20, and 30. Add the first two sides: 10 + 20 = 30. Add the third side to the sum: 30 + 30 = 60.
    Full step-by-step solution

    Step 1: Identify the lengths of the three sides: 10, 20, and 30. Step 2: Add the first two sides: 10 + 20 = 30. Step 3: Add the third side to the sum: 30 + 30 = 60. The total length of all three sides is 60 units.

  7. Ben had 10 crayons. Ben's teacher gave Ben 10 more crayons for a project. How many crayons does Ben have now? Answer: 20 Solution: Ben starts with 10 crayons. The teacher gives 10 more crayons. Add to find the total: 10 + 10 = 20.
    Full step-by-step solution

    Step 1: Ben starts with 10 crayons. Step 2: The teacher gives 10 more crayons. Step 3: Add to find the total: 10 + 10 = 20. Ben now has 20 crayons.

  8. Ethan is collecting toy cars. Ethan has 60 toy cars in a box and 20 toy cars on a shelf. How many toy cars does Ethan have in total? Answer: 80 Solution: Count the toy cars in the box: 60. Count the toy cars on the shelf: 20. Add them: 60 + 20 = 80.
    Full step-by-step solution

    Step 1: Count the toy cars in the box: 60. Step 2: Count the toy cars on the shelf: 20. Step 3: Add them: 60 + 20 = 80. Ethan has 80 toy cars in total.