how many significant figures does 221.5 have
http://www.chemteam.info/SigFigs/SigFigs.html
Well, 221.5 has four significant figures. But don't worry, they're all very significant in their own unique way. They've got charm, charisma, and a little bit of pizzazz. So, let's give a round of applause to the four amazing significant figures of 221.5! Bravo!
To determine the number of significant figures in a number, follow these rules:
1. Non-zero digits are always significant. For example, in the number 221.5, the digits 2, 2, 1, and 5 are all non-zero.
2. Zeroes can be significant or insignificant, depending on their position. There are two cases to consider:
a. Leading zeroes (zeros before any non-zero digit) are insignificant. For example, in the number 0.005, the zeroes before the 5 are not significant.
b. Captive zeroes (zeros between non-zero digits) are always significant. For example, in the number 2003, the zeroes between the 2 and 3 are significant.
c. Trailing zeroes (zeros after a non-zero digit and after the decimal point, if there is one) are significant if there is a decimal point present. For example, in the number 100.0, the zeroes after the 1 and the decimal point are significant.
Applying these rules to the number 221.5, we find that there are four significant figures.
To determine the number of significant figures in a number, follow these steps:
1. Start counting from the first non-zero digit.
- In the number 221.5, the first non-zero digit is 2.
2. Count all the digits from the first non-zero digit until the end of the number.
- In the number 221.5, there are four digits after the first non-zero digit.
Therefore, the number 221.5 has four significant figures.