Significant Figures Review

Front

What are significant figures?

Back

Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion.

Front

How do you determine the number of significant figures in a number?

Back

Count all non-zero digits, any zeros between them, and trailing zeros in a decimal number. Leading zeros are not counted.

Front

How many significant figures are in the number 4.20 cm?

Back

3 significant figures.

Front

How many significant figures are in the number 0.00204?

Back

3 significant figures.

Front

How many significant figures are in the number 450 m?

Back

2 significant figures.

Front

When multiplying or dividing, how do you determine the number of significant figures in the result?

Back

The result should have the same number of significant figures as the measurement with the least significant figures.

Front

When adding or subtracting, how do you determine the number of significant figures in the result?

Back

The result should have the same number of decimal places as the measurement with the least decimal places.

Front

Round 7520 x 0.021 = 157.92 to the correct number of significant figures.

Back

160 (rounded to 2 significant figures).

Front

Calculate 923 g ÷ 20312 cm³ and give your answer with the correct number of significant figures.

Back

0.0454 g/cm³ (rounded to 3 significant figures).

Front

What is the significance of trailing zeros in a decimal number?

Back

Trailing zeros in a decimal number are significant because they indicate precision.