Numbers on a number line
Represent whole numbers as lengths on a number line and represent sums and differences within 100 on a number line diagram
Teaching approaches
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1 approach
On a scaled number line, consecutive whole-number marks are equally spaced. The position of 38 is 38 units from zero. Addition moves right or forward by the length being added; subtraction moves left or backward by the length being subtracted. On a paper open number line, jump arcs are not drawn to scale—the labeled endpoints and + or − values show each jump. We can split a long jump into tens and ones while keeping the same total.
Spend 15 minutes using the 0–100 scale as a number line. Place whole numbers, then sketch efficient tens-and-ones jumps on paper to represent one addition and one subtraction within 100.
Learning resources
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This concept
Check understanding
- Place whole numbers on a number line with equally spaced points
- Show an addition as a jump forward on the number line (e.g. 38 + 27 shown as jumps)
- Show a subtraction as a jump backward on the number line
“Can your child mark numbers on a number line and show what happens when they add or subtract — for example, jumping forward 35 places from 48?”
Curriculum record
- Type
- Representational
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 7–8
Standards