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Decompose Numbers to 10

Kindergarten · Mathematics · Worksheet 2

  1. 10 = ? + 10 Answer: ______________
  2. Kaia has 10 cookies. 6 of them have chocolate chips and the rest are plain. How many cookies are plain? Answer: ______________
  3. 9 = 5 + ? Answer: ______________
  4. 6 = ? + 4 Answer: ______________
  5. Lily has 8 colorful blocks. She puts 3 blocks in a red box and the rest in a blue box. How many blocks does Lily put in the blue box? Answer: ______________
  6. Noah has 9 colorful stickers. He gives 4 stickers to his friend Emma. How many stickers does Noah have left? Answer: ______________
  7. Emma sees 8 birds on a fence. 6 of them fly away. How many birds are still on the fence? Answer: ______________
  8. 5 = ? + 4 Answer: ______________
  9. There are 4 red apples and 3 green apples in a bowl. How many apples are there in total? Answer: ______________
  10. 8 = 5 + ? Answer: ______________
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Answer Key & Explanations

Decompose Numbers to 10 · Kindergarten · Worksheet 2

  1. 10 = ? + 10 Answer: 0 Solution: Since 0 + 10 = 10, we know that 10 = 0 + 10.
  2. Kaia has 10 cookies. 6 of them have chocolate chips and the rest are plain. How many cookies are plain? Answer: 4 Solution: Kaia has 10 cookies in total. 6 have chocolate chips, so we subtract to find the plain ones: 10 - 6 = 4.
    Full step-by-step solution

    Step 1: Kaia has 10 cookies in total. Step 2: 6 have chocolate chips, so we subtract to find the plain ones: 10 - 6 = 4. The answer is 4.

  3. 9 = 5 + ? Answer: 4 Solution: We know that 9 equals 5 plus some number Start with 5 and count up to 9: 5, 6, 7, 8, 9 Count how many numbers we added: 6, 7, 8, 9 (that's 4 numbers) So 5 + 4 = 9 The answer is 4.
    Full step-by-step solution

    Step 1: We know that 9 equals 5 plus some number Step 2: Start with 5 and count up to 9: 5, 6, 7, 8, 9 Step 3: Count how many numbers we added: 6, 7, 8, 9 (that's 4 numbers) Step 4: So 5 + 4 = 9 The answer is 4.

  4. 6 = ? + 4 Answer: 2 Solution: Since 2 + 4 = 6, we know that 6 = 2 + 4.
  5. Lily has 8 colorful blocks. She puts 3 blocks in a red box and the rest in a blue box. How many blocks does Lily put in the blue box? Answer: 5 Solution: Lily starts with 8 blocks. 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 starts with 8 blocks. She puts 3 blocks in the red box. The rest go into the blue box. We need to find how many blocks go into the blue box. Step 2: Represent the total blocks and the blocks in the red box. Total blocks = 8 Blocks in red box = 3 Step 3: Find the number of blocks in the blue box. Since all blocks are either in the red box or the blue box, we subtract the red box blocks from the total: Blocks in blue box = Total blocks − Blocks in red box Blocks in blue box = 8 − 3 Step 4: Perform the subtraction. 8 − 3 = 5 Step 5: State the answer. Lily puts 5 blocks in the blue box.

  6. Noah has 9 colorful stickers. He gives 4 stickers to his friend Emma. How many stickers does Noah have left? Answer: 5 Solution: Noah starts with 9 stickers. He gives 4 stickers to Emma. To find how many are left, subtract the stickers he gave away from what he started with: 9 - 4.
    Full step-by-step solution

    Step 1: Noah starts with 9 stickers. Step 2: He gives 4 stickers to Emma. Step 3: To find how many are left, subtract the stickers he gave away from what he started with: 9 - 4. Step 4: 9 - 4 = 5. Noah has 5 stickers left.

  7. Emma sees 8 birds on a fence. 6 of them fly away. How many birds are still on the fence? Answer: 2 Solution: Start with 8 birds on the fence. 6 birds fly away, so we subtract: 8 - 6 = 2.
    Full step-by-step solution

    Step 1: Start with 8 birds on the fence. Step 2: 6 birds fly away, so we subtract: 8 - 6 = 2. The answer is 2.

  8. 5 = ? + 4 Answer: 1 Solution: Since 1 + 4 = 5, we know that 5 = 1 + 4.
  9. There are 4 red apples and 3 green apples in a bowl. How many apples are there in total? Answer: 7 Solution: Identify the number of red apples. There are 4 red apples. Identify the number of green apples.
    Full step-by-step solution

    Step 1: Identify the number of red apples. There are 4 red apples. Step 2: Identify the number of green apples. There are 3 green apples. Step 3: Add the number of red apples and green apples to find the total. Total apples = red apples + green apples Total apples = 4 + 3 Step 4: Perform the addition. 4 + 3 = 7 Step 5: State the final answer. There are 7 apples in total.

  10. 8 = 5 + ? Answer: 3 Solution: 8 = 5 + ? To find the unknown number, we need to isolate it on one side of the equation. Subtract 5 from the left side: 8 - 5 = 3 Subtract 5 from the right side: 5 + ?
    Full step-by-step solution

    We start with the equation: 8 = 5 + ? Step 1: To find the unknown number, we need to isolate it on one side of the equation. We can do this by subtracting 5 from both sides. Step 2: Subtract 5 from the left side: 8 - 5 = 3 Step 3: Subtract 5 from the right side: 5 + ? - 5 = ? Step 4: So the equation becomes: 3 = ? Step 5: This means the unknown number is 3. Final answer: 3