What does 7862.9 round to?

Answer 1

Rounded to 4 significant figures it becomes 7863.0

to 3 sf : 7860.0

to 2sf : 7900.0

to 1sf : 8000.0

The following rules may help.

Rounding off numbers.

1) If the first figure to be discarded is 5 or more, then the previous figure is increased by 1.

Example : 5.1935 = 5.194 (4sf) = 5.19 (3sf) = 5.2 (2sf) = 5 (1sf)

2) Zeros must be kept to show the position of the decimal point or to indicate that zero is a significant figure