# Lesson Worksheet: Estimating Calculations by Rounding to One, Two, or Three Significant Figures Mathematics

In this worksheet, we will practice estimating calculations by rounding to a specified number of significant figures throughout the calculation.

Q1:

The following figure shows Mason’s garden. Estimate the area of the figure by rounding to 2 significant figures. Q2:

Consider the given table and book. By rounding the book’s dimensions to 1 significant figure, approximately how many books can you put on the table to cover it all?

Q3:

Estimate by rounding both numbers to 1 significant figure.

Q4:

By rounding the lengths of the sides of the following triangle to 1 significant figure, find the perimeter. Q5:

You have 16 dollars and you need to divide this money equally among three people. By rounding the result to 2 significant figures, approximately how much will each one get?

Q6:

By rounding all of the numbers to 2 significant figures, which calculation would you carry out to estimate ?

• A
• B
• C
• D
• E

What is the estimated answer to ?

Q7:

Estimate by rounding each number to 1 siginificant figure.

Q8:

Natalie bought 2.5 kilograms of tomatoes. If one kilogram costs 2.15 pounds, round each number to 1 significant figure to estimate how much Natalie paid in total.

Q9:

Estimate by rounding each number to 3 significant figures.

Q10:

Estimate by rounding each number to 1 siginificant figure.

This lesson includes 63 additional question variations for subscribers.