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Number Sequence to 20

Kindergarten · Mathematics · Worksheet 3

  1. Look at the pattern: 🟥 🟥 🟥 | 🟥 🟥 🟥 | 🟥 🟥. How many red squares are there in total? Answer: ______________
  2. 5, 10, _, 20 Answer: ______________
  3. Kaia sees a number line on the wall. The numbers go: 13, 14, ____. What is the missing number? Answer: ______________
  4. Moana is hopping along a path of numbered stones. The stones Moana hops on say: 7, 8, ___. What number is on the missing stone? Answer: ______________
  5. 16, 17, _, 19, 20 Answer: ______________
  6. 12, _, 14, 15, 16 Answer: ______________
  7. Lily has 7 stickers. Her brother gives her 5 more stickers. How many stickers does Lily have now? Answer: ______________
  8. Noah has 6 toy dinosaurs. He finds 4 more toy dinosaurs under his bed. How many toy dinosaurs does Noah have now? Answer: ______________
  9. Moana is looking at a number line. The numbers go 16, 17, ____. What number is missing? Answer: ______________
  10. 12, 13, _, 15 Answer: ______________
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Answer Key & Explanations

Number Sequence to 20 · Kindergarten · Worksheet 3

  1. Look at the pattern: 🟥 🟥 🟥 | 🟥 🟥 🟥 | 🟥 🟥. How many red squares are there in total? Answer: 8 Solution: Count the first group before the first vertical bar. That's 3 red squares. Count the second group between the first and second vertical bars.
    Full step-by-step solution

    Let's break down the pattern step by step. The pattern is: 🟥 🟥 🟥 | 🟥 🟥 🟥 | 🟥 🟥 Step 1: Count the first group before the first vertical bar. First group: 🟥 🟥 🟥 That's 3 red squares. Step 2: Count the second group between the first and second vertical bars. Second group: 🟥 🟥 🟥 That's also 3 red squares. Step 3: Count the third group after the second vertical bar. Third group: 🟥 🟥 That's 2 red squares. Step 4: Add them together. 3 + 3 + 2 = 8 So, the total number of red squares is 8.

  2. 5, 10, _, 20 Answer: 15 Solution: Look at the sequence: 5, 10, _, 20. Count by fives: 5, 10, 15, 20. The missing number is 15.
    Full step-by-step solution

    Step 1: Look at the sequence: 5, 10, _, 20. Step 2: Count by fives: 5, 10, 15, 20. Step 3: The missing number is 15. The answer is 15.

  3. Kaia sees a number line on the wall. The numbers go: 13, 14, ____. What is the missing number? Answer: 15 Solution: Look at the two numbers we know: 13 and 14. The numbers go up by 1 each time. From 13 to 14 is +1.
    Full step-by-step solution

    Step 1: Look at the two numbers we know: 13 and 14. Step 2: The numbers go up by 1 each time. From 13 to 14 is +1. Step 3: So the missing number must be 14 + 1 = 15. The answer is 15.

  4. Moana is hopping along a path of numbered stones. The stones Moana hops on say: 7, 8, ___. What number is on the missing stone? Answer: 9 Solution: See the numbers on the stones Moana hopped on: 7 and 8. The numbers go in order, increasing by 1 each time: 7 to 8 is +1. The missing stone comes after 8, so it is 8 + 1 = 9.
    Full step-by-step solution

    Step 1: See the numbers on the stones Moana hopped on: 7 and 8. Step 2: The numbers go in order, increasing by 1 each time: 7 to 8 is +1. Step 3: The missing stone comes after 8, so it is 8 + 1 = 9. The answer is 9.

  5. 16, 17, _, 19, 20 Answer: 18 Solution: Look at the sequence: 16, 17, _, 19, 20. Count forward from 16: 16, 17, 18, 19, 20. The missing number is 18.
    Full step-by-step solution

    Step 1: Look at the sequence: 16, 17, _, 19, 20. Step 2: Count forward from 16: 16, 17, 18, 19, 20. Step 3: The missing number is 18. The answer is 18.

  6. 12, _, 14, 15, 16 Answer: 13 Solution: Look at the sequence: 12, _, 14, 15, 16. Count forward from 12: 12, 13, 14, 15, 16. The number between 12 and 14 is 13.
    Full step-by-step solution

    Step 1: Look at the sequence: 12, _, 14, 15, 16. Step 2: Count forward from 12: 12, 13, 14, 15, 16. Step 3: The number between 12 and 14 is 13. The answer is 13.

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

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

  8. Noah has 6 toy dinosaurs. He finds 4 more toy dinosaurs under his bed. How many toy dinosaurs does Noah have now? Answer: 10 Solution: Noah starts with 6 toy dinosaurs. He finds 4 more toy dinosaurs. Add the two groups together: 6 + 4 6 + 4 = 10 Noah has 10 toy dinosaurs now.
    Full step-by-step solution

    Step 1: Noah starts with 6 toy dinosaurs. Step 2: He finds 4 more toy dinosaurs. Step 3: Add the two groups together: 6 + 4 Step 4: 6 + 4 = 10 Noah has 10 toy dinosaurs now.

  9. Moana is looking at a number line. The numbers go 16, 17, ____. What number is missing? Answer: 18 Solution: The numbers skip one number between them: 16, then 17. Count forward from 16: 16, 16+1=17, then the next number is 17+1 = 18.
    Full step-by-step solution

    Step 1: The numbers skip one number between them: 16, then 17. Step 2: Count forward from 16: 16, 16+1=17, then the next number is 17+1 = 18. The answer is 18.

  10. 12, 13, _, 15 Answer: 14 Solution: Look at the sequence: 12, 13, _, 15 Notice that 12 comes before 13, so the numbers are increasing 13 is one more than 12, so the pattern is counting up by ones After 13 comes 14, then 15 The missing number is 14 The answer is 14.
    Full step-by-step solution

    Step 1: Look at the sequence: 12, 13, _, 15 Step 2: Notice that 12 comes before 13, so the numbers are increasing Step 3: 13 is one more than 12, so the pattern is counting up by ones Step 4: After 13 comes 14, then 15 Step 5: The missing number is 14 The answer is 14.