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Reading and completing number lines

Find missing numbers on evenly spaced number lines.

Practice + answer key · 3 pages

Worksheet settings8 questions · 2 columns · A4
Allowed line values

Every line starts and ends inside these bounds. Increase the span if there is not room for two intervals.

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mathsprig-1
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44801cc3
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2 pages
Reading and completing number linesReading and completing number lines. Practice. Write the missing number at the marked tick. Write the missing number at the marked tick. Write the missing number at the marked tick. Write the missing number at the marked tick. Write the missing number at the marked tick. Write the missing number at the marked tick.Name __________________________Date _______________Reading and completing number linesWrite the missing number at the marked tick.Worked exampleA line runs from 10 to 30 in four equal intervals. What is the second tickafter 10? → 20The full difference is 30 − 10 = 20.1.Write the missing number at themarked tick.182022?262.Write the missing number at themarked tick.89?11121314153.Write the missing number at themarked tick.24?424.Write the missing number at themarked tick.9?295.Write the missing number at themarked tick.22?286.Write the missing number at themarked tick.616?3646MathSprig · mathsprig.site · support@mathsprig.sitePage 1 of 2mathsprig-1 · mathsprig-v1 · 44801cc3
Reading and completing number linesReading and completing number lines. Practice. Write the missing number at the marked tick. Write the missing number at the marked tick.Name __________________________Date _______________Reading and completing number linesWrite the missing number at the marked tick.7.Write the missing number at themarked tick.1624?408.Write the missing number at themarked tick.1317?252933374145MathSprig · mathsprig.site · support@mathsprig.sitePage 2 of 2mathsprig-1 · mathsprig-v1 · 44801cc3
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Practice + answer key · 3 pages

Number sense

What you’ll practice

Determine the size of an equal interval and use it to identify a missing whole number.

Count the spaces between the labeled ends to work out the size of each step. Then use those equal steps to find the missing number.

How this skill works

Count intervals rather than tick marks: a line with five ticks has four intervals. Divide the difference between endpoint values by the number of intervals.

Start at a labeled endpoint and move the correct number of intervals to the marked position. Equal visual distances represent equal numerical changes.

Worked example

A line runs from 10 to 30 in four equal intervals. What is the second tick after 10?
  1. The full difference is 30 − 10 = 20.
  2. Each interval represents 20 ÷ 4 = 5.
  3. Two intervals after 10 gives 10 + 2 × 5 = 20.

Answer: 20

Teaching notes

  • Count spaces between ticks, not the ticks themselves.
  • Use the other endpoint to check the interval size.
Practice questions
  1. Write the missing number at the marked tick.

    A number line from 18 to 26, split into 4 equal intervals. Tick 3, counting from zero at the left endpoint, is marked with a question mark.

  2. Write the missing number at the marked tick.

    A number line from 8 to 15, split into 7 equal intervals. Tick 2, counting from zero at the left endpoint, is marked with a question mark.

  3. Write the missing number at the marked tick.

    A number line from 24 to 42, split into 2 equal intervals. Tick 1, counting from zero at the left endpoint, is marked with a question mark.

  4. Write the missing number at the marked tick.

    A number line from 9 to 29, split into 2 equal intervals. Tick 1, counting from zero at the left endpoint, is marked with a question mark.

  5. Write the missing number at the marked tick.

    A number line from 22 to 28, split into 2 equal intervals. Tick 1, counting from zero at the left endpoint, is marked with a question mark.

  6. Write the missing number at the marked tick.

    A number line from 6 to 46, split into 4 equal intervals. Tick 2, counting from zero at the left endpoint, is marked with a question mark.

  7. Write the missing number at the marked tick.

    A number line from 16 to 40, split into 3 equal intervals. Tick 2, counting from zero at the left endpoint, is marked with a question mark.

  8. Write the missing number at the marked tick.

    A number line from 13 to 45, split into 8 equal intervals. Tick 2, counting from zero at the left endpoint, is marked with a question mark.

Answers and steps
  1. 24
    1. Each interval is (26 − 18) ÷ 4 = 2.
    2. Move 3 intervals from 18: 18 + 3 × 2 = 24.
  2. 10
    1. Each interval is (15 − 8) ÷ 7 = 1.
    2. Move 2 intervals from 8: 8 + 2 × 1 = 10.
  3. 33
    1. Each interval is (42 − 24) ÷ 2 = 9.
    2. Move 1 intervals from 24: 24 + 1 × 9 = 33.
  4. 19
    1. Each interval is (29 − 9) ÷ 2 = 10.
    2. Move 1 intervals from 9: 9 + 1 × 10 = 19.
  5. 25
    1. Each interval is (28 − 22) ÷ 2 = 3.
    2. Move 1 intervals from 22: 22 + 1 × 3 = 25.
  6. 26
    1. Each interval is (46 − 6) ÷ 4 = 10.
    2. Move 2 intervals from 6: 6 + 2 × 10 = 26.
  7. 32
    1. Each interval is (40 − 16) ÷ 3 = 8.
    2. Move 2 intervals from 16: 16 + 2 × 8 = 32.
  8. 21
    1. Each interval is (45 − 13) ÷ 8 = 4.
    2. Move 2 intervals from 13: 13 + 2 × 4 = 21.