One-to-One Correspondence

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Answer Key & Explanations

One-to-One Correspondence · Kindergarten · Worksheet 3

1. 10 dogs each need 1 bone. How many bones? Answer: 10 Solution: There are 10 dogs. Step 2: Each dog needs 1 bone. Step 3: Match each dog to one bone.
   Full step-by-step solution

   Step 1: There are 10 dogs. Step 2: Each dog needs 1 bone. Step 3: Match each dog to one bone. Step 4: Count the bones: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. The answer is 10.

2. Aroha has 7 cupcakes. Each cupcake needs 1 candle. How many candles does Aroha need? Answer: 7 Solution: Aroha has 7 cupcakes. Each cupcake needs exactly 1 candle.
   Full step-by-step solution

   Step 1: Aroha has 7 cupcakes. Step 2: Each cupcake needs exactly 1 candle. Step 3: Match each cupcake to one candle: cupcake 1 gets candle 1, cupcake 2 gets candle 2, cupcake 3 gets candle 3, cupcake 4 gets candle 4, cupcake 5 gets candle 5, cupcake 6 gets candle 6, cupcake 7 gets candle 7. Step 4: Count all the candles: 1, 2, 3, 4, 5, 6, 7. The answer is 7.

3. Tommy has 5 toy cars. He lines them up in a row. How many toy cars does Tommy have? Answer: 5 Solution: 1. Read the problem carefully: "Tommy has 5 toy cars." 2. The problem states that Tommy lines them up in a row, but this doesn't change the number of toy cars he has.
   Full step-by-step solution

   Step-by-step solution: 1. Read the problem carefully: "Tommy has 5 toy cars." 2. The problem states that Tommy lines them up in a row, but this doesn't change the number of toy cars he has. Lining them up is just arranging them, not adding or removing any cars. 3. The question asks: "How many toy cars does Tommy have?" 4. From the first sentence, we know Tommy started with 5 toy cars. 5. Since no cars were added or removed, the number remains the same. 6. Therefore, Tommy has 5 toy cars. Final answer: 5

4. Noah has 6 cups. He needs 1 straw for each cup. How many straws does he need? Answer: 6 Solution: Count the cups: 1, 2, 3, 4, 5, 6. There are 6 cups. Each cup needs 1 straw, so we need the same number of straws as cups.
   Full step-by-step solution

   Step 1: Count the cups: 1, 2, 3, 4, 5, 6. There are 6 cups. Step 2: Each cup needs 1 straw, so we need the same number of straws as cups. Step 3: 6 cups means 6 straws. The answer is 6.

5. Hana has 6 cookies. She wants to give each friend 1 cookie. How many friends can get a cookie? Answer: 6 Solution: Hana has 6 cookies. Step 2: Each friend gets exactly 1 cookie.
   Full step-by-step solution

   Step 1: Hana has 6 cookies. Step 2: Each friend gets exactly 1 cookie. Step 3: Match each cookie to one friend: cookie 1 for friend 1, cookie 2 for friend 2, cookie 3 for friend 3, cookie 4 for friend 4, cookie 5 for friend 5, cookie 6 for friend 6. Step 4: Counting all the friends gives 6 friends. The answer is 6.

6. Emma has 5 stickers. Her friend Liam gives her 3 more stickers. How many stickers does Emma have now? Answer: 8 Solution: Emma starts with 5 stickers Liam gives her 3 more stickers Add the stickers together: 5 + 3 5 + 3 = 8 Emma has 8 stickers now.
   Full step-by-step solution

   Step 1: Emma starts with 5 stickers Step 2: Liam gives her 3 more stickers Step 3: Add the stickers together: 5 + 3 Step 4: 5 + 3 = 8 Emma has 8 stickers now.

7. Look at the pattern of hearts: ♥ ♥ ♥ ♥ | ♥ ♥ ♥ ♥ | ♥ ♥ ♥ ♥. How many hearts are in each row? Answer: 4 Solution: Count the hearts in this first group: 1, 2, 3, 4 Each row has 4 hearts.
   Full step-by-step solution

   Step 1: Look at the first group of hearts: ♥ ♥ ♥ ♥ Step 2: Count the hearts in this first group: 1, 2, 3, 4 Step 3: Each row has 4 hearts. The answer is 4.

8. Emma has 5 stickers. Her brother Liam gives her 4 more stickers. How many stickers does Emma have now? Answer: 9 Solution: Emma starts with 5 stickers. Liam gives her 4 more stickers. To find the total, add the two groups: 5 + 4.
   Full step-by-step solution

   Step 1: Emma starts with 5 stickers. Step 2: Liam gives her 4 more stickers. Step 3: To find the total, add the two groups: 5 + 4. Step 4: 5 + 4 = 9. The answer is 9.

9. Aroha has 9 flowers. She wants to put each flower in its own vase. How many vases does she need? Answer: 9 Solution: Aroha has 9 flowers. Step 2: Each flower needs its own vase. Step 3: Match each flower to one vase: 1 flower to 1 vase, 2 flowers to 2 vases, and so on.
   Full step-by-step solution

   Step 1: Aroha has 9 flowers. Step 2: Each flower needs its own vase. Step 3: Match each flower to one vase: 1 flower to 1 vase, 2 flowers to 2 vases, and so on. Step 4: Count the flowers: 1, 2, 3, 4, 5, 6, 7, 8, 9. Step 5: She needs 9 vases. The answer is 9.

10. Matiu has 12 toy cars. He gives 1 toy car to each of his friends. How many friends get a toy car? Answer: 12 Solution: Matiu has 12 toy cars. Step 2: He gives 1 car to each friend. Step 3: This is a one-to-one match: 1 car for 1 friend.
    Full step-by-step solution

    Step 1: Matiu has 12 toy cars. Step 2: He gives 1 car to each friend. Step 3: This is a one-to-one match: 1 car for 1 friend. Step 4: The number of friends equals the number of cars. Step 5: 12 cars means 12 friends get a car. The answer is 12.