To add -4 and 5, draw the starting number on a number line and count to the right when adding numbers. What is the difference in temperature between a desert at 40 °C and a mountain top at -2 °C? \(40 ...

In this KS3 lesson, links are made to the science topic of electricity to help learners understand adding and subtracting directed (positive and negative) numbers. Lots of learners have heard that ...

Opposite of a number is the number that is the same distance from the zero, but on the other side of it. For example: opposite of 3 is -3, of the 5 is -5, 72 is -72 and so on... One way to think about ...

A line drawing of the Internet Archive headquarters building façade. An illustration of a magnifying glass. An illustration of a magnifying glass.