Signed multiplication

When multiplying, the same signs give a positive product and different signs give a negative product. On the number line, b jumps of size a land on a × b.

− × + = −Signed multiplication

📐 Formula

(+)(+) = +, (−)(−) = +, (+)(−) = (−)(+) = −

✏️ Worked example

(−3) × 4 = −12: four jumps of −3 from 0.

🌍 Where it is used

Repeated losses (losing ₹3 a day for 4 days is −₹12).

❓ Quick check

(−5) × (−4) = ?

🏋️ Practice

Easy(−2) × 6 = ?

Answer: −12

Medium(−7) × (−3) = ?

Answer: 21

ChallengeWhat sign does (−1) × (−1) × (−1) have?

Answer: Negative (−1)