Round the following numbers to 2 significant digits.
A. 3472 B. 8416
C. 255 and D. 285
(a) In 3472, 7 comes after the digit 4. Its value is greater than 5. So, the next two digits are neglected and 4 is increased by one. The value becomes 3500.
(b) 84
(c) 2.6
(d) 29