Rounding (significant figures)

Question 1

How do you use significant figures?

Answer 1

Count the number of significant figures from the first non-zero number. After you find the first non-zero number, zeros count as a sf.

Question 2

Round 0.043502 to 1, 2, 3 and 4 sf

Answer 2

1sf: 0.04
2sf: 0.044
3sf: 0.0435
4sf:0.04350

Question 3

Round 520368 to 1, 2, 3 and 4 sf

Answer 3

1sf: 500 000
2sf: 520 000
3sf: 520 000
4sf: 520 400