Start by completing the calculation using positive numbers first, then use the sign rules to find the sign of the answer. Image caption, This multiplication table includes both positive and negative ...

What are positive and negative numbers? Any number above zero is a positive number. Positive numbers are written with no sign or a '\({+}\)' sign in front of them and they are counted up from zero to ...

Explore the fascinating history of negative numbers from ancient times to Renaissance acceptance, highlighted in BBC Radio 4's program. In 1759 the British mathematician Francis Maseres wrote that ...