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Can you determine the number of significant figures?

Use the following multiple choice activity to practice determining the number of significant figures in numbers and calculations.

How many significant digits in 100?

  1. 1
  2. 2
  3. 3
  4. 4

Right! Only count trailing zeroes if there is a decimal point.

Only count trailing zeroes if there is a decimal point.

Only count trailing zeroes if there is a decimal point.

Only count trailing zeroes if there is a decimal point.

How many significant digits in 1.00?

  1. 1
  2. 2
  3. 3
  4. 4

Count trailing zeroes that come after a decimal point.

Count trailing zeroes that come after a decimal point.

Excellent! Count trailing zeroes that come after a decimal point.

Count trailing zeroes that come after a decimal point.

How many significant digits in 4.023?

  1. 1
  2. 2
  3. 3
  4. 4

The zero is between two significant figures, so it is significant.

The zero is between two significant figures, so it is significant.

The zero is between two significant figures, so it is significant.

Good job! The zero is between two significant figures, so it is significant.

How many significant digits in 0.00023?

  1. 2
  2. 3
  3. 4
  4. 5

Correct. All the zeroes in this number are leading zeroes.

All the zeroes in this number are leading zeroes.

All the zeroes in this number are leading zeroes.

All the zeroes in this number are leading zeroes.

102.45 - 97.543

  1. 4.9
  2. 4.91
  3. 5
  4. 5.0

For adding and subtracting, make sure to round to the least number of digits after the decimal.

Great! For adding and subtracting, make sure to round to the least number of digits after the decimal.

For adding and subtracting, make sure to round to the least number of digits after the decimal.

For adding and subtracting, make sure to round to the least number of digits after the decimal.

\(\mathsf{\frac{21}{7}}\)

  1. 3
  2. 3.0
  3. 3.00
  4. 3.000

Excellent! For multiplication and division, use the number of significant digits of the number with the least significant figures.

For multiplication and division, use the number of significant digits of the number with the least significant figures.

For multiplication and division, use the number of significant digits of the number with the least significant figures.

For multiplication and division, use the number of significant digits of the number with the least significant figures.

13.78 + 7.2

  1. 20.98
  2. 20.0
  3. 21.00
  4. 21.0

For adding and subtracting, make sure to round to the least number of digits after the decimal.

For adding and subtracting, make sure to round to the least number of digits after the decimal.

For adding and subtracting, make sure to round to the least number of digits after the decimal.

Good job! For adding and subtracting, make sure to round to the least number of digits after the decimal.

6.78 + 3.4

  1. 10.20
  2. 10.2
  3. 10
  4. 11

For adding and subtracting, make sure to round to the least number of digits after the decimal.

Excellent! For adding and subtracting, make sure to round to the least number of digits after the decimal.

For adding and subtracting, make sure to round to the least number of digits after the decimal.

For adding and subtracting, make sure to round to the least number of digits after the decimal.

\(\mathsf{56.0 \times 3.50}\)

  1. 196
  2. 196.0
  3. 200
  4. 200.0

Excellent! For multiplication and division, use the number of significant digits of the number with the least significant figures.

For multiplication and division, use the number of significant digits of the number with the least significant figures.

For multiplication and division, use the number of significant digits of the number with the least significant figures.

For multiplication and division, use the number of significant digits of the number with the least significant figures.

Summary

Questions answered correctly:

Questions answered incorrectly: