Significant Figures Practice

How many sig figs are there?
100.00

• 1

• 3

• 4

• 5

Answer explanation

The number 100.00 has five significant figures. The zeros after the decimal point are significant, indicating precision. Therefore, the correct answer is 5.

How many sig figs are there?
100000000

• 1

• 9

• 10

Answer explanation

The number 100000000 has only 1 significant figure because it is written without a decimal point. Leading zeros are not counted, and trailing zeros in a whole number without a decimal point are not considered significant.

How many sig figs are there?
4004

• 1

• 2

• 3

• 4

Answer explanation

The number 4004 has four significant figures. All non-zero digits are significant, and zeros between non-zero digits are also significant. Therefore, the correct answer is 4.

How many sig figs are there?
0.00400

• 1

• 3

• 5

• 6

Answer explanation

The number 0.00400 has three significant figures. The leading zeros (0.00) are not counted, but the trailing zeros (400) are significant because they indicate precision.

How many sig figs are there?
27000000

• 2

• 5

• 8

Answer explanation

The number 27000000 has 2 significant figures. The trailing zeros are not counted as significant unless specified by a decimal point. Thus, the correct answer is 2.

How many sig figs are there?
4000.

• 1

• 3

• 4

Answer explanation

The number 4000 has four significant figures because it is written in a way that indicates all digits are significant. The trailing zeros in a whole number without a decimal point are considered significant.

Which of the following numbers have four significant figures?

• 56.75 g

• 40.01 g

• 0.6000 g

• all of the choices

Answer explanation

All the numbers listed have four significant figures. 56.75 has four digits, 40.01 has four digits, and 0.6000 has four significant figures due to the trailing zeros. Therefore, the correct answer is 'all of the choices'.

All of the following have one significant figure except:

• 100 cm

• 0.0001 cm

• 2 cm

• 2.00 cm

Answer explanation

The number 2.00 cm has three significant figures due to the trailing zeros, while the others have only one significant figure. Therefore, 2.00 cm is the only option that does not have one significant figure.

Which of the following numbers has three significant figures?

• 1014 miles
• 101 feet
• 1000 yards
• all of the choices

How many significant figures does the following number have: 0.998005

• 9

• 10

• 6

• 5

Answer explanation

The number 0.998005 has 6 significant figures. All non-zero digits are significant, and zeros between significant digits are also counted. Therefore, the correct answer is 6.