Decompose Numbers to 10

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Answer Key & Explanations

Decompose Numbers to 10 · Kindergarten · Worksheet 1

1. Aroha sees 6 birds on a fence. 0 of them fly away. How many birds are still on the fence? Answer: 6 Solution: Start with 6 birds on the fence. 0 birds fly away, so we subtract: 6 - 0 = 6.
   Full step-by-step solution

   Step 1: Start with 6 birds on the fence. Step 2: 0 birds fly away, so we subtract: 6 - 0 = 6. The answer is 6.

2. Liam has 8 toy cars. He puts 3 of them in a red box and the rest in a blue box. How many toy cars are in the blue box? Answer: 5 Solution: Liam starts with 8 toy cars in total. He puts 3 of these toy cars into a red box. This means we subtract 3 from the total number of cars to find out how many are left.
   Full step-by-step solution

   Step 1: Liam starts with 8 toy cars in total. Step 2: He puts 3 of these toy cars into a red box. This means we subtract 3 from the total number of cars to find out how many are left. Calculation: 8 - 3 = 5 Step 3: The problem says the rest of the cars go into the blue box. Since 5 cars are left after putting 3 in the red box, all of these go into the blue box. Step 4: Therefore, the number of toy cars in the blue box is 5.

3. Lily has 8 colorful blocks. She puts 3 blocks in a red box and the rest in a blue box. How many blocks are in the blue box? Answer: 5 Solution: Lily has 8 blocks in total. She puts 3 blocks in the red box. The rest go into the blue box.
   Full step-by-step solution

   Step 1: Understand the problem. Lily has 8 blocks in total. She puts 3 blocks in the red box. The rest go into the blue box. We need to find how many blocks are in the blue box. Step 2: Identify the total number of blocks. Total blocks = 8. Step 3: Identify how many blocks are in the red box. Red box = 3 blocks. Step 4: Find the number of blocks in the blue box. Since the rest of the blocks go into the blue box, we subtract the red box blocks from the total blocks: Blue box blocks = Total blocks - Red box blocks Blue box blocks = 8 - 3 Step 5: Perform the calculation. 8 - 3 = 5 Step 6: State the final answer. The blue box has 5 blocks.

4. Sam has 6 toy cars. He gives 2 cars to his friend. How many toy cars does Sam have left? Answer: 4 Solution: Sam starts with 6 toy cars. He gives away 2 cars to his friend. To find how many he has left, subtract 2 from 6: 6 - 2 = 4.
   Full step-by-step solution

   Step 1: Sam starts with 6 toy cars. Step 2: He gives away 2 cars to his friend. Step 3: To find how many he has left, subtract 2 from 6: 6 - 2 = 4. The answer is 4.

5. 8 = ? + 8 Answer: 0 Solution: Since 0 + 8 = 8, we know that 8 = 0 + 8.
6. 3 = ? + 2 Answer: 1 Solution: Since 1 + 2 = 3, we know that 3 = 1 + 2.
7. Tom has 5 crayons. 1 are red and the rest are blue. How many blue crayons does Tom have? Answer: 4 Solution: Tom has 5 crayons total. 1 are red, so we find the blue ones by subtracting: 5 - 1 = 4.
   Full step-by-step solution

   Step 1: Tom has 5 crayons total. Step 2: 1 are red, so we find the blue ones by subtracting: 5 - 1 = 4. The answer is 4.

8. Lily has 8 crayons. 2 are red and the rest are blue. How many blue crayons does Lily have? Answer: 6 Solution: Lily has 8 crayons total. 2 are red, so we find the blue ones by subtracting: 8 - 2 = 6.
   Full step-by-step solution

   Step 1: Lily has 8 crayons total. Step 2: 2 are red, so we find the blue ones by subtracting: 8 - 2 = 6. The answer is 6.

9. Look at the pattern of stars: ★ ★ ★ ★ | ★ ★ ★ ★ | ★ ★ ★ ★. How many stars are there in total? Answer: 12 Solution: Count the number of groups: There are 3 groups of stars. Count how many stars are in each group: Each group has 4 stars. Add the stars together: 4 + 4 + 4 = 12 The total number of stars is 12.
   Full step-by-step solution

   Step 1: Count the number of groups: There are 3 groups of stars. Step 2: Count how many stars are in each group: Each group has 4 stars. Step 3: Add the stars together: 4 + 4 + 4 = 12 Step 4: The total number of stars is 12.

10. Noah has 8 cookies. 0 of them have chocolate chips and the rest are plain. How many cookies are plain? Answer: 8 Solution: Noah has 8 cookies in total. 0 have chocolate chips, so we subtract to find the plain ones: 8 - 0 = 8.
    Full step-by-step solution

    Step 1: Noah has 8 cookies in total. Step 2: 0 have chocolate chips, so we subtract to find the plain ones: 8 - 0 = 8. The answer is 8.