Overall, it clarifies that zero is an essential number, not a troublemaker in arithmetic. Keywords zero, mathematics, addition, subtraction, empty set, placeholder, rounding off, numbers ...

Save guides, add subjects and pick up where you left off with your BBC account. A number line is a straight line with numbers written in order from lowest to highest. Number lines can go up to any ...

You cannot add or subject imaginary numbers. Another example of an imaginary number is infinity. One identifying characteristic of real numbers is that they can be represented over a number line.