Number Line
From counting on the line to instant recall.
A number line makes addition and subtraction visible — the next step is doing it without counting. A 10-question Num Drill quiz takes about a minute and adapts to the facts your child keeps missing.
Start a quiz Addition & subtractionWhat a number line is
A number line is a straight line with numbers placed at equal intervals along it. It turns abstract quantity into distance you can see and point to: bigger numbers sit to the right, smaller numbers to the left, and the gap between any two marks is the difference between them. The arrows on each end mean the line keeps going forever in both directions. Use the buttons above to switch the range — a 0–10 or 0–20 line for early counting, 0–100 by tens for place value, −10 to 10 for integers, or halves for an introduction to fractions.
How to use it for addition and subtraction
The number line shines for early addition and subtraction because each operation becomes a jump. Tap a starting number, then tap where you land, and the line draws the hop and tells you the move:
- Addition = jump right. To do 3 + 4, start at 3 and count four marks forward to land on 7.
- Subtraction = jump left. To do 9 − 5, start at 9 and count five marks back to land on 4.
- Distance = the difference. The length of the jump between two numbers is exactly how far apart they are — the idea behind “counting up” to subtract.
Beyond counting: place value, negatives, and fractions
The same line scales with your child. A 0–100 by tens line builds a feel for place value and rounding (which ten is 63 closest to?). The −10 to 10 line introduces negative numbers and shows why subtracting can cross zero. The halves line is a gentle on-ramp to fractions — seeing that ½ sits exactly between 0 and 1 makes fractions far less abstract. Once the concept clicks, move to retrieval: addition & subtraction practice weights the facts your child misses most.
Printable vs. interactive
Tap Blank mode to hide the numbers, then Print for a clean fill-in-the-blank line your child can label by hand — great for a worksheet or a desk reference. Keep the numbers on for a ready-made wall strip. As with any reference tool, the goal is to make the line unnecessary over time: use it to build the picture, then drill toward recall so the math becomes automatic.
Related: addition & subtraction · fractions practice · multiplication chart · 1st grade math · 2nd grade math