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Find missing numbers on a number line

A missing number on a number line is determined by the ordered sequence, equal intervals, labeled benchmarks, and the scale of the line; the learner counts forward or backward by ones, tens, or hundreds to identify whole numbers within 0–1,000. This understanding connects position, magnitude, place value, and addition or subtraction, while excluding negative numbers, fractions, decimals, and more abstract or nonuniform scales.

Detailed Explanation: Find missing numbers on a number line

A number line shows numbers in order. Because the spaces are equal, you can count by the same amount from one mark to the next.

Example:

0—10—20—?—40—500 \quad\text{—}\quad 10 \quad\text{—}\quad 20 \quad\text{—}\quad ? \quad\text{—}\quad 40 \quad\text{—}\quad 50
  1. Look at the labeled numbers. They go from 00 to 1010 to 2020.
  2. The numbers increase by 1010 each time.
  3. Count forward one more group of 1010 after 2020:
20+10=3020+10=30
  1. Check the pattern: 2020, 3030, 4040.

So, the missing number is 3030.

When the number line moves to the right, count forward. When it moves to the left, count backward. Always check how much the numbers change between the labeled marks.

Learn by doing: Find missing numbers on a number line

Click a topic below to practice the foundational skills you'll need, learn the steps, or master this skill

    Practice with unlimited practice problems

    Number Line - Positive Integers, Read Number - From Ticks

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