We start by counting decimal places after the decimal point.
Example: - 2.3526 has 4 d.p
- 20.13 (2 d.p)
- 0.000081 (6 d.p)
When writing a number, a given number of decimal places we take the following steps:
- Count the number of places and draw a line.
- Check the digit immediately after the line.
- Round it up to 1 and add to the digit just before the line if the digit is 5 or more.
- Throw it away if the digit is less than 5.
Example 1: Write 602567 correct to:
- 2 d.p
- 1 d.p
Solution
- 6.25|67 = 6.26 (to 2 d.p)
- 6.2|567 = 6.3 (to 1 d.p)
Example 2: Write 8.3748 correct to:
- 2 d.p
- 3 d.p
Solution
- 8.37|48 = 8.37 (to 2 d.p)
- 8.374|8 = 8.375 (to 3 d.p)
