Add Three Numbers

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Answer Key & Explanations

Add Three Numbers · Grade 1 · Worksheet 3

1. There are 5 red circles in the first row, 3 blue circles in the second row, and 2 green circles in the third row. How many circles are there in all? Answer: 10 Solution: Count the red circles in the first row: 5 Count the blue circles in the second row: 3 Count the green circles in the third row: 2 Add all the circles together: 5 + 3 + 2 First add 5 + 3 = 8 Then add 8 + 2 = 10 The answer is 10.
   Full step-by-step solution

   Step 1: Count the red circles in the first row: 5 Step 2: Count the blue circles in the second row: 3 Step 3: Count the green circles in the third row: 2 Step 4: Add all the circles together: 5 + 3 + 2 Step 5: First add 5 + 3 = 8 Step 6: Then add 8 + 2 = 10 The answer is 10.

2. There are 3 rows of flowers in a garden. The first row has 5 flowers, the second row has 6 flowers, and the third row has 4 flowers. How many flowers are there in all? Answer: 15 Solution: Count the flowers in the first row: 5 flowers. Count the flowers in the second row: 6 flowers. Count the flowers in the third row: 4 flowers.
   Full step-by-step solution

   Step 1: Count the flowers in the first row: 5 flowers. Step 2: Count the flowers in the second row: 6 flowers. Step 3: Count the flowers in the third row: 4 flowers. Step 4: Add all the flowers together: 5 + 6 + 4. Step 5: First, add 5 + 6 = 11. Step 6: Then, add 11 + 4 = 15. The answer is 15.

3. Emma has 6 stickers. Her friend Mia gives her 4 more stickers. Then Emma's teacher gives her 3 more stickers for good work. How many stickers does Emma have now? Answer: 13 Solution: Emma starts with 6 stickers Mia gives her 4 more stickers: 6 + 4 = 10 Her teacher gives her 3 more stickers: 10 + 3 = 13 Emma has 13 stickers in total The answer is 13.
   Full step-by-step solution

   Step 1: Emma starts with 6 stickers Step 2: Mia gives her 4 more stickers: 6 + 4 = 10 Step 3: Her teacher gives her 3 more stickers: 10 + 3 = 13 Step 4: Emma has 13 stickers in total The answer is 13.

4. Tommy has 5 red marbles, 3 blue marbles, and 2 green marbles. How many marbles does Tommy have in all? Answer: 10 Solution: Identify the number of each color of marble. - 5 red marbles - 3 blue marbles - 2 green marbles Add the red and blue marbles together. 5 + 3 = 8 marbles Add the green marbles to the total from Step 2.
   Full step-by-step solution

   Step 1: Identify the number of each color of marble. Tommy has: - 5 red marbles - 3 blue marbles - 2 green marbles Step 2: Add the red and blue marbles together. 5 + 3 = 8 marbles Step 3: Add the green marbles to the total from Step 2. 8 + 2 = 10 marbles Step 4: State the final answer. Tommy has 10 marbles in all.

5. Liam collected 8 seashells at the beach. His sister Mia found 5 more seashells and gave them to him. Then their dad gave Liam 2 more seashells from his collection. How many seashells does Liam have now? Answer: 15 Solution: Liam started with 8 seashells Mia gave him 5 more seashells: 8 + 5 = 13 His dad gave him 2 more seashells: 13 + 2 = 15 Liam has 15 seashells in total The answer is 15.
   Full step-by-step solution

   Step 1: Liam started with 8 seashells Step 2: Mia gave him 5 more seashells: 8 + 5 = 13 Step 3: His dad gave him 2 more seashells: 13 + 2 = 15 Step 4: Liam has 15 seashells in total The answer is 15.

6. Emma has 6 stickers. Her friend Noah gives her 4 more stickers. Then Emma's teacher gives her 3 more stickers. How many stickers does Emma have now? Answer: 13 Solution: Emma starts with 6 stickers Noah gives her 4 more stickers: 6 + 4 = 10 Her teacher gives her 3 more stickers: 10 + 3 = 13 The answer is 13.
   Full step-by-step solution

   Step 1: Emma starts with 6 stickers Step 2: Noah gives her 4 more stickers: 6 + 4 = 10 Step 3: Her teacher gives her 3 more stickers: 10 + 3 = 13 The answer is 13.

7. Matiu sees three groups of stars. The first group has 2 stars, the second group has 4 stars, and the third group has 6 stars. How many stars are there in all? Answer: 12 Solution: Count the stars in the first group: 2 stars. Count the stars in the second group: 4 stars. Add the first two groups: 2 + 4 = 6 stars.
   Full step-by-step solution

   Step 1: Count the stars in the first group: 2 stars. Step 2: Count the stars in the second group: 4 stars. Step 3: Add the first two groups: 2 + 4 = 6 stars. Step 4: Count the stars in the third group: 6 stars. Step 5: Add the third group to the total: 6 + 6 = 12 stars. The answer is 12.

8. A triangle has sides of length 5 cm, 6 cm, and 7 cm. What is the perimeter of the triangle? Answer: 18 Solution: Identify the three side lengths: 5 cm, 6 cm, and 7 cm. Add the first two sides: 5 + 6 = 11. Add the third side to the sum: 11 + 7 = 18.
   Full step-by-step solution

   Step 1: Identify the three side lengths: 5 cm, 6 cm, and 7 cm. Step 2: Add the first two sides: 5 + 6 = 11. Step 3: Add the third side to the sum: 11 + 7 = 18. The perimeter is 18 cm.