How would you get precision to 3 significant figures if there is a 3333333333.33 and the least number was 750?

Answer 1

When you've finished operating on your numbers to round to 3 sig fig you want to round to the first three digits starting with the first non-zero digit by using the fourth digit (as normal) and then replace all further digits to the right by zeros and removing any digits so changed to zero after a decimal point.

Examples:

12345 to 3 sig fig is 12300 since the 4 does not round up the 3.

124578 to 3 sig fig is 125000 since the 5 rounds up the 4.

0.1234 to 3 sig fig is 0.123 since the 4 does not round up the 3 and the trailing zeros (created) are removed.

0.001234 to 3 sig fig is 0.00123

12984 to 3 sig fig is 13000 since the 8 rounds the 9 up.

0.012984 to 3 sig fig is 0.0130 since the 8 rounds the 9 up.

3333333333.33 to 3 sig fig is 3330000000