One-to-One Correspondence

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Answer Key & Explanations

One-to-One Correspondence · Kindergarten · Worksheet 3

1. Isabella has 7 hats. She needs one head for each hat. How many heads does she need? Answer: 7 Solution: Count the hats: 1, 2, 3, 4, 5, 6, 7. There are 7 hats. Step 2: Each hat needs one head, so we need the same number of heads as hats.
   Full step-by-step solution

   Step 1: Count the hats: 1, 2, 3, 4, 5, 6, 7. There are 7 hats. Step 2: Each hat needs one head, so we need the same number of heads as hats. Step 3: 7 hats means 7 heads. The answer is 7.

2. Hana has 6 flowers. She wants to put each flower in its own vase. How many vases does Hana need? Answer: 6 Solution: Hana has 6 flowers. Each flower needs exactly 1 vase.
   Full step-by-step solution

   Step 1: Hana has 6 flowers. Step 2: Each flower needs exactly 1 vase. Step 3: Match each flower to one vase: flower 1 needs vase 1, flower 2 needs vase 2, flower 3 needs vase 3, flower 4 needs vase 4, flower 5 needs vase 5, flower 6 needs vase 6. Step 4: Count the vases: 1, 2, 3, 4, 5, 6. The answer is 6.

3. 6 = ? Answer: 6 Solution: The number 6 represents 6 objects, like 6 cups or 6 children. In one-to-one correspondence, each object needs exactly one matching object. So 6 objects need 6 matching objects.
   Full step-by-step solution

   Step 1: The number 6 represents 6 objects, like 6 cups or 6 children. Step 2: In one-to-one correspondence, each object needs exactly one matching object. Step 3: So 6 objects need 6 matching objects. Step 4: The answer is 6.

4. Hana has 8 cookies. She wants to put each cookie on its own plate. How many plates does she need? Answer: 8 Solution: Count the cookies: 1, 2, 3, 4, 5, 6, 7, 8. There are 8 cookies. Each cookie needs its own plate, so we need the same number of plates as cookies.
   Full step-by-step solution

   Step 1: Count the cookies: 1, 2, 3, 4, 5, 6, 7, 8. There are 8 cookies. Step 2: Each cookie needs its own plate, so we need the same number of plates as cookies. Step 3: 8 cookies means 8 plates. The answer is 8.

5. 5 dogs each need 1 bone. How many bones? Answer: 5 Solution: There are 5 dogs. Step 2: Each dog needs 1 bone. Step 3: Count the dogs: 1, 2, 3, 4, 5.
   Full step-by-step solution

   Step 1: There are 5 dogs. Step 2: Each dog needs 1 bone. Step 3: Count the dogs: 1, 2, 3, 4, 5. Step 4: Since each dog gets exactly one bone, you need 5 bones. The answer is 5.

6. Emma has 7 apples. She wants to give 1 apple to each of her friends. How many friends can get an apple? Answer: 7 Solution: Emma has 7 apples. Step 2: Each friend gets 1 apple.
   Full step-by-step solution

   Step 1: Emma has 7 apples. Step 2: Each friend gets 1 apple. Step 3: Match each apple to one friend: 1 apple for friend 1, 1 apple for friend 2, 1 apple for friend 3, 1 apple for friend 4, 1 apple for friend 5, 1 apple for friend 6, 1 apple for friend 7. Step 4: That makes 7 friends. The answer is 7.

7. 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.

8. 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.

9. 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.

10. Emma has 5 toy ducks. Her brother Liam gives her 4 more toy ducks. How many toy ducks does Emma have now? Answer: 9 Solution: Emma starts with 5 toy ducks. Liam gives her 4 more toy ducks. Add the two groups together: 5 + 4 5 + 4 = 9 Emma has 9 toy ducks now.
    Full step-by-step solution

    Step 1: Emma starts with 5 toy ducks. Step 2: Liam gives her 4 more toy ducks. Step 3: Add the two groups together: 5 + 4 Step 4: 5 + 4 = 9 Emma has 9 toy ducks now.