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Number Sequence to 20

Kindergarten · Mathematics · Worksheet 1

  1. Look at this number pattern: 10, 11, 12, _, 14. What number is missing? Answer: ______________
  2. Kai is hopping along a path of numbered stones. The stones Kai hops on say: 13, 14, ___. What number is on the missing stone? Answer: ______________
  3. Aroha is hopping along a path of numbered stones. The stones Aroha hops on say: 15, 16, ___. What number is on the missing stone? Answer: ______________
  4. Noah sees a number line on the wall. The numbers go: 9, 10, ____. What is the missing number? Answer: ______________
  5. 14, 15, _, 17, 18 Answer: ______________
  6. Alex is looking at a number line. The numbers go 17, 18, ____. What number is missing? Answer: ______________
  7. Look at the pattern: 🟦 🟦 🟦 🟦 | 🟦 🟦 🟦 🟦 | 🟦 🟦 🟦. How many blue squares are there in total? Answer: ______________
  8. Emma has 7 stickers on her notebook. Her friend gives her 5 more stickers. How many stickers does Emma have now? Answer: ______________
  9. 8, 9, _, 11, 12 Answer: ______________
  10. 2, _, 4, 5, 6 Answer: ______________
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Answer Key & Explanations

Number Sequence to 20 · Kindergarten · Worksheet 1

  1. Look at this number pattern: 10, 11, 12, _, 14. What number is missing? Answer: 13 Solution: The pattern shows counting by ones: 10, 11, 12, ?, 14. After 12, the next number is 13. Check: 10, 11, 12, 13, 14 — all numbers are in order.
    Full step-by-step solution

    Step 1: The pattern shows counting by ones: 10, 11, 12, ?, 14. Step 2: After 12, the next number is 13. Step 3: Check: 10, 11, 12, 13, 14 — all numbers are in order. The answer is 13.

  2. Kai is hopping along a path of numbered stones. The stones Kai hops on say: 13, 14, ___. What number is on the missing stone? Answer: 15 Solution: See the numbers on the stones Kai hopped on: 13 and 14. The numbers go in order, increasing by 1 each time: 13 to 14 is +1. The missing stone comes after 14, so it is 14 + 1 = 15.
    Full step-by-step solution

    Step 1: See the numbers on the stones Kai hopped on: 13 and 14. Step 2: The numbers go in order, increasing by 1 each time: 13 to 14 is +1. Step 3: The missing stone comes after 14, so it is 14 + 1 = 15. The answer is 15.

  3. Aroha is hopping along a path of numbered stones. The stones Aroha hops on say: 15, 16, ___. What number is on the missing stone? Answer: 17 Solution: See the numbers on the stones Aroha hopped on: 15 and 16. The numbers go in order, increasing by 1 each time: 15 to 16 is +1. The missing stone comes after 16, so it is 16 + 1 = 17.
    Full step-by-step solution

    Step 1: See the numbers on the stones Aroha hopped on: 15 and 16. Step 2: The numbers go in order, increasing by 1 each time: 15 to 16 is +1. Step 3: The missing stone comes after 16, so it is 16 + 1 = 17. The answer is 17.

  4. Noah sees a number line on the wall. The numbers go: 9, 10, ____. What is the missing number? Answer: 11 Solution: Look at the two numbers we know: 9 and 10. The numbers go up by 1 each time. From 9 to 10 is +1.
    Full step-by-step solution

    Step 1: Look at the two numbers we know: 9 and 10. Step 2: The numbers go up by 1 each time. From 9 to 10 is +1. Step 3: So the missing number must be 10 + 1 = 11. The answer is 11.

  5. 14, 15, _, 17, 18 Answer: 16 Solution: Look at the sequence: 14, 15, _, 17, 18. Count forward from 14: 14, 15, 16, 17, 18. The missing number is 16.
    Full step-by-step solution

    Step 1: Look at the sequence: 14, 15, _, 17, 18. Step 2: Count forward from 14: 14, 15, 16, 17, 18. Step 3: The missing number is 16. The answer is 16.

  6. Alex is looking at a number line. The numbers go 17, 18, ____. What number is missing? Answer: 19 Solution: The numbers skip one number between them: 17, then 18. Count forward from 17: 17, 17+1=18, then the next number is 18+1 = 19.
    Full step-by-step solution

    Step 1: The numbers skip one number between them: 17, then 18. Step 2: Count forward from 17: 17, 17+1=18, then the next number is 18+1 = 19. The answer is 19.

  7. Look at the pattern: 🟦 🟦 🟦 🟦 | 🟦 🟦 🟦 🟦 | 🟦 🟦 🟦. How many blue squares are there in total? Answer: 11 Solution: Count the squares in the first group: 🟦 🟦 🟦 🟦 = 4 squares Count the squares in the second group: 🟦 🟦 🟦 🟦 = 4 squares Count the squares in the third group: 🟦 🟦 🟦 = 3 squares Add all the squares together: 4 + 4 + 3 4 + 4 = 8, then 8 + 3 = 11 The answer is 11.
    Full step-by-step solution

    Step 1: Count the squares in the first group: 🟦 🟦 🟦 🟦 = 4 squares Step 2: Count the squares in the second group: 🟦 🟦 🟦 🟦 = 4 squares Step 3: Count the squares in the third group: 🟦 🟦 🟦 = 3 squares Step 4: Add all the squares together: 4 + 4 + 3 Step 5: 4 + 4 = 8, then 8 + 3 = 11 The answer is 11.

  8. Emma has 7 stickers on her notebook. Her friend gives her 5 more stickers. How many stickers does Emma have now? Answer: 12 Solution: Emma starts with 7 stickers. Her friend gives her 5 more stickers. Add the stickers together: 7 + 5 7 + 5 = 12 Emma has 12 stickers now.
    Full step-by-step solution

    Step 1: Emma starts with 7 stickers. Step 2: Her friend gives her 5 more stickers. Step 3: Add the stickers together: 7 + 5 Step 4: 7 + 5 = 12 Emma has 12 stickers now.

  9. 8, 9, _, 11, 12 Answer: 10 Solution: Look at the sequence: 8, 9, _, 11, 12 Notice that 8 comes before 9, and 11 comes before 12 The numbers are counting up by ones: 8, 9, 10, 11, 12 The missing number is 10 The answer is 10.
    Full step-by-step solution

    Step 1: Look at the sequence: 8, 9, _, 11, 12 Step 2: Notice that 8 comes before 9, and 11 comes before 12 Step 3: The numbers are counting up by ones: 8, 9, 10, 11, 12 Step 4: The missing number is 10 The answer is 10.

  10. 2, _, 4, 5, 6 Answer: 3 Solution: Look at the sequence: 2, _, 4, 5, 6. Count forward from 2: 2, 3, 4, 5, 6. The missing number between 2 and 4 is 3.
    Full step-by-step solution

    Step 1: Look at the sequence: 2, _, 4, 5, 6. Step 2: Count forward from 2: 2, 3, 4, 5, 6. Step 3: The missing number between 2 and 4 is 3. The answer is 3.