How to round to the nearest tenth
When the calculations do not need super accuracy,there is a need to round off decimals to tenths. The result is an approximate number. To emphasize this fact, you need to use a special symbol ≈, which is read "approximately equal".
To round off the number to tenths, you need to leave one number behind the decimal point, and discard the rest, taking into account the rounding rules:
- if the second digit after the comma is in the range from 0 to 4 inclusive - the first digit after the comma is left unchanged
- if the second digit after the comma is in the range from 5 to 9 inclusive - the first digit after the comma is increased by one
For clarity, consider a few examples.
- It is necessary to round off to the tenth number 44,308,163.To complete the task, you must leave one number after the decimal point. Since the second digit is 0, the first digit after the comma remains unchanged. Thus, 44,308163 ≈ 44,3
- 187.697651 ≈ 187.7.To round the number to tenths, we leave only one figure after the decimal point. Since the second digit after the comma is 9, the first digit is increased by one.
- 49.986236 ≈ 50.0.The second figure after the decimal equals 8, which means that the first digit increases by one. Since 9 + 1 = 10, the whole number before the comma has increased by one.