One-to-One Correspondence

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One-to-One Correspondence · Kindergarten · Worksheet 1

1. Mere 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.

2. Lily has 4 teddy bears. Her friend Noah gives her 3 more teddy bears. How many teddy bears does Lily have now? Answer: 7 Solution: Lily starts with 4 teddy bears. Noah gives her 3 more teddy bears. Add the teddy bears together: 4 + 3 4 + 3 = 7 Lily has 7 teddy bears now.
   Full step-by-step solution

   Step 1: Lily starts with 4 teddy bears. Step 2: Noah gives her 3 more teddy bears. Step 3: Add the teddy bears together: 4 + 3 Step 4: 4 + 3 = 7 Lily has 7 teddy bears now.

3. Emma has 5 toy ducks. Her friend Liam gives her 3 more toy ducks. How many toy ducks does Emma have now? Answer: 8 Solution: Emma starts with 5 toy ducks Liam gives her 3 more toy ducks Count all the ducks together: 5 + 3 5 + 3 = 8 The answer is 8.
   Full step-by-step solution

   Step 1: Emma starts with 5 toy ducks Step 2: Liam gives her 3 more toy ducks Step 3: Count all the ducks together: 5 + 3 Step 4: 5 + 3 = 8 The answer is 8.

4. 9 = ? Answer: 9 Solution: There are 9 objects in the first group. Each object needs exactly one matching object. So we need 9 objects in the second group.
   Full step-by-step solution

   Step 1: There are 9 objects in the first group. Step 2: Each object needs exactly one matching object. Step 3: So we need 9 objects in the second group. The answer is 9.

5. Matiu has 14 balloons. He gives one balloon to each child. How many children get a balloon? Answer: 14 Solution: Matiu has 14 balloons. Step 2: He gives 1 balloon to each child. Step 3: Count the balloons: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14.
   Full step-by-step solution

   Step 1: Matiu has 14 balloons. Step 2: He gives 1 balloon to each child. Step 3: Count the balloons: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14. Step 4: Since each child gets exactly one balloon, the number of children is the same as the number of balloons. Step 5: 14 balloons means 14 children get a balloon. The answer is 14.

6. Mere has 6 flowers. She needs 1 vase for each flower. How many vases does she need? Answer: 6 Solution: Count the flowers: 6 flowers. Each flower needs 1 vase, so we match 1 vase to each flower. 6 flowers need 6 vases.
   Full step-by-step solution

   Step 1: Count the flowers: 6 flowers. Step 2: Each flower needs 1 vase, so we match 1 vase to each flower. Step 3: 6 flowers need 6 vases. The answer is 6.

7. 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.

8. 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.

9. Emma has 6 crayons. Her friend Liam gives her 4 more crayons. How many crayons does Emma have now? Answer: 10 Solution: Emma starts with 6 crayons. Liam gives her 4 more crayons. Add the crayons together: 6 + 4 6 + 4 = 10 The answer is 10.
   Full step-by-step solution

   Step 1: Emma starts with 6 crayons. Step 2: Liam gives her 4 more crayons. Step 3: Add the crayons together: 6 + 4 Step 4: 6 + 4 = 10 The answer is 10.

10. Matiu has 12 toy dinosaurs. Each dinosaur needs 1 toy tree to play under. How many toy trees does Matiu need? Answer: 12 Solution: Matiu has 12 toy dinosaurs. Each dinosaur needs 1 toy tree. Match each dinosaur to one tree: dinosaur 1 gets tree 1, dinosaur 2 gets tree 2, and so on up to dinosaur 12.
    Full step-by-step solution

    Step 1: Matiu has 12 toy dinosaurs. Step 2: Each dinosaur needs 1 toy tree. Step 3: Match each dinosaur to one tree: dinosaur 1 gets tree 1, dinosaur 2 gets tree 2, and so on up to dinosaur 12. Step 4: Counting all the trees gives 12 toy trees. The answer is 12.