How to round up to the whole
Often in the calculations, the result is notan integer, and a decimal fraction is a number with several decimal places. If accuracy does not play a decisive role, you can discard the numbers after the decimal point, using the simplest rule of mathematics - how to round the number to the whole.
To round the number to the whole, you need to discard the fractional part, paying attention to the figure that stands first after the decimal point:
- if it is less than 5, the whole number is left unchanged
- if equal to or greater than 5, the integer increases by 1
To denote the fact that the calculations are approximate, rounded, a special symbol ≈ ("approximately equal") is used.
Let's see how the rounding rules work on examples.
- It is necessary to round up to integers 75,381.The first digit after the comma 3. It is less than five, so the whole number is left unchanged. Therefore the answer is 75,381 ≈ 75.
- 162.592.The first digit after the decimal equals 5. The whole part is increased by one. Answer: 162,592 ≈ 163.
- 159,925.The figure after the comma is 9, it is greater than 5. Add an integer to the integer. Answer: 160.