Why are the rules of significant figures when calculating a number, such as area, from measured values?

Top 2 Answers

A few days ago

Favorite Answer

round down when:

1. the digit following the last sig. fig. is a 0,1,2,3, or 4. eg: 23.64 becomes 23.6

2. the last sig. fig. is an even number and the number to the right is a 5, with no other nonzero digits, eg: 32.25 becomes 32.2

round up when:

1. the digit following the last sig. fig. is a 6,7,8, or 9. eg: 45.69 becomes 45.7

2. the last sig. fig. is an odd number and the number to the right is a 5, with no other nonzero digits. eg: 12.350000 becomes 28.4

3. the digit following the last sig. fig. is a 5 followed by a nonzero digit. eg: 12.853332 becomes 12.9

A few days ago

Anonymous

plus or minus half the smallest increment…i think lol

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