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 ...

Same signs give a positive: \((-4) \times (-5) = 20\) Same signs give a positive: \(20 \div 5 = 4\) Different signs give a negative: \((-14) \div 2 = -7\) Different ...

Explore the fascinating history of negative numbers from ancient times to Renaissance acceptance, highlighted in BBC Radio 4's program. Don't miss** BBC Radio 4's In Our Time program on Negative ...

Multiplying 2 x 2 is easy. But multiplying two numbers with more than a billion digits each — that takes some serious computation. The multiplication technique taught in grade school may be simple, ...

Multiplication of two numbers is easy, right? At primary school we learn how to do long multiplication like this: Methods similar to this go back thousands of years, at least to the ancient Sumerians ...