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Missing Addend

Grade 1 · Mathematics · Worksheet 2

  1. 8 + ? = 15 Answer: ______________
  2. Ethan baked 10 cookies. Ethan baked some more cookies. Now there are 13 cookies in total. How many more cookies did Ethan bake? Answer: ______________
  3. Liam has 8 toy cars. His friend Noah gives him some more toy cars. Now Liam has 15 toy cars. How many toy cars did Noah give Liam? Answer: ______________
  4. A rectangle is drawn with 4 rows of circles. Each row has 3 circles. How many circles are there in total?
    Answer: ______________
  5. Emma has 7 stickers. She wants to have 12 stickers in total for her sticker book. How many more stickers does Emma need to get? Answer: ______________
  6. Emma baked 9 cookies. Emma baked some more cookies. Now there are 14 cookies in total. How many more cookies did Emma bake? Answer: ______________
  7. Oliver has 9 stickers. Oliver needs 15 stickers in total. How many more stickers does Oliver need to get? Answer: ______________
  8. A classroom has desks arranged in 4 rows. Each row has 5 desks. How many desks are there in total? Answer: ______________
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Answer Key & Explanations

Missing Addend · Grade 1 · Worksheet 2

  1. 8 + ? = 15 Answer: 7 Solution: We know 8 + ? = 15 To find the missing number, think about what number added to 8 equals 15 Start from 8 and count up to 15: 9, 10, 11, 12, 13, 14, 15 That's 7 more numbers So 8 + 7 = 15 The answer is 7.
    Full step-by-step solution

    Step 1: We know 8 + ? = 15 Step 2: To find the missing number, think about what number added to 8 equals 15 Step 3: Start from 8 and count up to 15: 9, 10, 11, 12, 13, 14, 15 Step 4: That's 7 more numbers Step 5: So 8 + 7 = 15 The answer is 7.

  2. Ethan baked 10 cookies. Ethan baked some more cookies. Now there are 13 cookies in total. How many more cookies did Ethan bake? Answer: 3 Solution: Ethan baked 10 cookies first. Now there are 13 cookies in total. The extra cookies baked are the difference: 13 - 10 = 3.
    Full step-by-step solution

    Step 1: Ethan baked 10 cookies first. Step 2: Now there are 13 cookies in total. Step 3: The extra cookies baked are the difference: 13 - 10 = 3. Ethan baked 3 more cookies.

  3. Liam has 8 toy cars. His friend Noah gives him some more toy cars. Now Liam has 15 toy cars. How many toy cars did Noah give Liam? Answer: 7 Solution: 1. Liam starts with 8 toy cars. 2.
    Full step-by-step solution

    Let's go step by step. 1. Liam starts with 8 toy cars. 2. After Noah gives him some more, Liam has 15 toy cars. 3. Let the number of toy cars Noah gives be x. 4. We can write an equation: Starting cars + Cars from Noah = Total cars now 8 + x = 15 5. To find x, subtract 8 from both sides: x = 15 - 8 6. Calculate: x = 7 So, Noah gave Liam 7 toy cars.

  4. A rectangle is drawn with 4 rows of circles. Each row has 3 circles. How many circles are there in total? Answer: 12 Solution: We have a rectangle with 4 rows of circles, and each row has 3 circles. There are 4 rows, and each row contains 3 circles.
    Full step-by-step solution

    We have a rectangle with 4 rows of circles, and each row has 3 circles. Step 1: Understand the arrangement. There are 4 rows, and each row contains 3 circles. Step 2: To find the total number of circles, we multiply the number of rows by the number of circles in each row. That is: Total circles = number of rows × circles per row Step 3: Substitute the numbers. Total circles = 4 × 3 Step 4: Perform the multiplication. 4 × 3 = 12 Step 5: Conclusion. The total number of circles is 12.

  5. Emma has 7 stickers. She wants to have 12 stickers in total for her sticker book. How many more stickers does Emma need to get? Answer: 5 Solution: Emma starts with 7 stickers. She wants to have 12 stickers in total. To find how many more she needs, subtract the stickers she has from the total she wants: 12 - 7.
    Full step-by-step solution

    Step 1: Emma starts with 7 stickers. Step 2: She wants to have 12 stickers in total. Step 3: To find how many more she needs, subtract the stickers she has from the total she wants: 12 - 7. Step 4: 12 - 7 = 5. The answer is 5.

  6. Emma baked 9 cookies. Emma baked some more cookies. Now there are 14 cookies in total. How many more cookies did Emma bake? Answer: 5 Solution: Emma baked 9 cookies first. Now there are 14 cookies in total. The extra cookies baked are the difference: 14 - 9 = 5.
    Full step-by-step solution

    Step 1: Emma baked 9 cookies first. Step 2: Now there are 14 cookies in total. Step 3: The extra cookies baked are the difference: 14 - 9 = 5. Emma baked 5 more cookies.

  7. Oliver has 9 stickers. Oliver needs 15 stickers in total. How many more stickers does Oliver need to get? Answer: 6 Solution: Oliver has 9 stickers. Oliver needs 15 stickers in total. To find how many more are needed, subtract what Oliver has from what is needed: 15 - 9 = 6.
    Full step-by-step solution

    Step 1: Oliver has 9 stickers. Step 2: Oliver needs 15 stickers in total. Step 3: To find how many more are needed, subtract what Oliver has from what is needed: 15 - 9 = 6. Oliver needs 6 more stickers.

  8. A classroom has desks arranged in 4 rows. Each row has 5 desks. How many desks are there in total? Answer: 20 Solution: There are 4 rows of desks. Each row has 5 desks. To find the total, multiply the number of rows by the number of desks in each row: 4 × 5 4 × 5 = 20 The answer is 20.
    Full step-by-step solution

    Step 1: There are 4 rows of desks. Step 2: Each row has 5 desks. Step 3: To find the total, multiply the number of rows by the number of desks in each row: 4 × 5 Step 4: 4 × 5 = 20 The answer is 20.