We start counting significant figures from the first non-zero digit.
Example: - 8.2341 has 5 s.f
- 0.00056 (2 s.f)
- 3.023 (4 s.f)
When a number is not having a decimal part, we replace all the digits after the line with zeros.
Example 1: Write 4.82056 correct to:
- 2 s.f
- 3 s.f
- 5 s.f
Solution
- 4.9
- 4.82
- 4.8206
Example 2: Write 68254 correct to:
- 2 s.f
- 3 s.f
- 1 s.f
Solution
- 68|254 = 68000 (to 2 s.f)
- 682|54 = 68300 (to 3 s.f)
- 6|8254 = 70000 (to 1 s.f)
