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Use a number line

A number line represents whole numbers from 0 through 120 in a fixed order with equal intervals, so position shows magnitude and the distance between two points shows their difference. Learners use it to locate, compare, and order numbers and to reason about counting forward or backward for addition and subtraction, recognizing that movement right increases a quantity and movement left decreases it; fractions, negative numbers, decimals, and generalized or nonuniform scales are beyond this scope.

Detailed Explanation: Use a number line

A number line shows whole numbers in order. Each tick mark stands for one number, and the spaces between ticks are equal.

  • Numbers get larger as you move right.
  • Numbers get smaller as you move left.
  • Moving right means adding.
  • Moving left means subtracting.

Example: Solve 46+346+3.

  1. Find 4646 on the number line. This is your starting point.
  2. Since you are adding, move right.
  3. Move one step at a time and count three steps:
    • 46→4746\to47 — 1 step
    • 47→4847\to48 — 2 steps
    • 48→4948\to49 — 3 steps
  4. You land on 4949.

Therefore,

46+3=4946+3=49

Learn by doing: Use 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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