Leave the digit the same if the next digit is less than 5 (this is called rounding down) but increase it by 1 if the next digit is 5 or more (this is called rounding up). The rounded value must be a ...

The digit in a number which best indicates its size is known as the ‘first significant figure’. It is always the first non zero digit in the number. Significant figure is often abbreviated to sig. fig ...

When you are doing arithmetic by hand because your calculator’s batteries just gave up and your laptop is in the other room, it’s best if you can check your calculations with a different process than ...