While the previous methods are useful for calculating the half of a number, mental math can be an even quicker way to halve a number. Mental math involves performing calculations in your head, without the need for a calculator or pen and paper. To halve a number using mental math, you need to be familiar with some basic math facts, such as multiplication tables and number relationships. For example, if you want to halve the number 16, you can simply recall that 16 is double 8, and therefore half of 16 is 8. Similarly, if you want to halve the number 35, you can recall that 35 is 5 times 7, and therefore half of 35 is 17.5., Learn how to calculate the half of a number with our simple half calculator tool. Whether you prefer division, mental math, or tricks for even or odd numbers, we've got you covered. Master this fundamental operation and build a strong foundation in math., One half of 450 is 225. To find half of a number, you simply divide it by 2. In this case, 450 divided by 2 equals 225. This can be confirmed by multiplying 225 by 2 to get back to the original number, 450..