One-to-One Correspondence

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One-to-One Correspondence · Kindergarten · Worksheet 2

1. Mason has 7 toy trains. Each train needs 1 track piece to ride on. How many track pieces does Mason need? Answer: 7 Solution: Mason has 7 toy trains. Each toy train needs exactly 1 track piece. Match each train to one track piece: train 1 needs 1 track, train 2 needs 1 track, and so on for all 7 trains.
   Full step-by-step solution

   Step 1: Mason has 7 toy trains. Step 2: Each toy train needs exactly 1 track piece. Step 3: Match each train to one track piece: train 1 needs 1 track, train 2 needs 1 track, and so on for all 7 trains. Step 4: Counting all the track pieces gives 7 track pieces. The answer is 7.

2. Mere has 15 toy trucks. Each truck needs 1 garage space. How many garage spaces does Mere need? Answer: 15 Solution: Mere has 15 toy trucks. Each truck needs exactly 1 garage space. Match each truck to one garage space: truck 1 gets space 1, truck 2 gets space 2, and so on.
   Full step-by-step solution

   Step 1: Mere has 15 toy trucks. Step 2: Each truck needs exactly 1 garage space. Step 3: Match each truck to one garage space: truck 1 gets space 1, truck 2 gets space 2, and so on. Step 4: Counting all the spaces needed gives 15. The answer is 15.

3. Mason has 7 toy cars. He gives 1 toy car to each of his friends. How many friends get a toy car? Answer: 7 Solution: Mason has 7 toy cars. He gives 1 toy car to each friend. Count the toy cars: 1, 2, 3, 4, 5, 6, 7.
   Full step-by-step solution

   Step 1: Mason has 7 toy cars. Step 2: He gives 1 toy car to each friend. Step 3: Count the toy cars: 1, 2, 3, 4, 5, 6, 7. Step 4: Since each friend gets exactly one toy car, the number of friends is the same as the number of toy cars. Step 5: 7 toy cars means 7 friends get a toy car. The answer is 7.

4. Emma has 5 toy boats. Each boat needs 1 sailor. How many sailors does Emma need? Answer: 5 Solution: Emma has 5 toy boats. Step 2: Each boat needs 1 sailor. Step 3: Match each boat to one sailor: boat 1 gets sailor 1, boat 2 gets sailor 2, boat 3 gets sailor 3, boat 4 gets sailor 4, boat 5 gets sailor 5.
   Full step-by-step solution

   Step 1: Emma has 5 toy boats. Step 2: Each boat needs 1 sailor. Step 3: Match each boat to one sailor: boat 1 gets sailor 1, boat 2 gets sailor 2, boat 3 gets sailor 3, boat 4 gets sailor 4, boat 5 gets sailor 5. Step 4: Count the sailors: 1, 2, 3, 4, 5. The answer is 5.

5. 2 = ? Answer: 2 Solution: Look at the number 2 on the left side of the equals sign. In a one-to-one match, the number on the right must be the same as the number on the left.
   Full step-by-step solution

   Step 1: Look at the number 2 on the left side of the equals sign. Step 2: In a one-to-one match, the number on the right must be the same as the number on the left. Step 3: So the answer is 2. The answer is 2.

6. Look at the pattern of ducks: 🦆 🦆 🦆 🦆 🦆 | 🦆 🦆 🦆 🦆 🦆 | 🦆 🦆 🦆. How many ducks are there in total? Answer: 13 Solution: Count the ducks in the first group: 🦆 🦆 🦆 🦆 🦆 = 5 ducks Count the ducks in the second group: 🦆 🦆 🦆 🦆 🦆 = 5 ducks Count the ducks in the third group: 🦆 🦆 🦆 = 3 ducks Add all the ducks together: 5 + 5 + 3 = 13 The answer is 13.
   Full step-by-step solution

   Step 1: Count the ducks in the first group: 🦆 🦆 🦆 🦆 🦆 = 5 ducks Step 2: Count the ducks in the second group: 🦆 🦆 🦆 🦆 🦆 = 5 ducks Step 3: Count the ducks in the third group: 🦆 🦆 🦆 = 3 ducks Step 4: Add all the ducks together: 5 + 5 + 3 = 13 The answer is 13.

7. Emma has 5 toy ducks. Her friend 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 ducks 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 ducks together: 5 + 4 Step 4: 5 + 4 = 9 Emma has 9 toy ducks now.

8. Aroha has 9 apples. She wants to put each apple into its own basket. How many baskets does Aroha need? Answer: 9 Solution: Aroha has 9 apples. Each apple needs 1 basket. Match each apple to one basket: apple 1 goes in basket 1, apple 2 in basket 2, and so on until apple 9 in basket 9.
   Full step-by-step solution

   Step 1: Aroha has 9 apples. Step 2: Each apple needs 1 basket. Step 3: Match each apple to one basket: apple 1 goes in basket 1, apple 2 in basket 2, and so on until apple 9 in basket 9. Step 4: Count the baskets: 1, 2, 3, 4, 5, 6, 7, 8, 9. Aroha needs 9 baskets. The answer is 9.

9. Hana has 4 hats. She needs one hat for each head. How many heads can wear a hat? Answer: 4 Solution: Count the hats: 1, 2, 3, 4. There are 4 hats. Each hat goes on one head, so the number of heads that can wear a hat is the same as the number of hats.
   Full step-by-step solution

   Step 1: Count the hats: 1, 2, 3, 4. There are 4 hats. Step 2: Each hat goes on one head, so the number of heads that can wear a hat is the same as the number of hats. Step 3: 4 hats means 4 heads can wear a hat. The answer is 4.

10. Mere has 12 flowers. She needs one vase for each flower. How many vases does she need? Answer: 12 Solution: Count the flowers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. There are 12 flowers. Each flower needs one vase, so we need the same number of vases as flowers.
    Full step-by-step solution

    Step 1: Count the flowers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. There are 12 flowers. Step 2: Each flower needs one vase, so we need the same number of vases as flowers. Step 3: 12 flowers means 12 vases. The answer is 12.