Number Line

The number line is a way of seeing numbers laid out on a straight line. Every number has its own place.

• Negative numbers — positives sit to the right of zero, negatives to the left.
• Addition means jumping right. Subtraction means jumping left.
• The frog 🐸 hops one number at a time until it reaches the answer.
• In Compare mode, the line marks which number is larger.

3 worked examples:

1. 5 + 3 — start at 5, hop 3 to the right: 6, 7, 8. The answer is 8.
2. 2 − 4 — start at 2, hop 4 to the left: 1, 0, −1, −2. The answer is −2.
3. −3 ⟷ −1 — both numbers are negative, but −1 is closer to 0, so it is the larger one.

💼 Real-life uses: temperature (above/below 0°C), lifts going up and down, working out debt or savings.