To estimate means to find something close to the exact answer. Rounding off lengths is an important calculation we must learn, since it's used extensively in our daily lives. However, unlike simple rounding off questions, you cannot decrease the value when rounding off numbers. In other words, if you measure a length of cloth to cover your car, with a length of 198.3 cm. Now, by normal rounding off rules, you can round off the numbers to 198. But it can be possible that even this little margin can make some of the car to remain uncovered. So, in this case, we'll increase the length to 199cm to avoid shortening of the covered cloth.

In these worksheets, your students will learn to estimate length by rounding off the values of a given problem and then calculating the answer mentally, without writing the problem down. They will then solve for the exact length using whatever mathematical operation is required by the question. Finally, they will determine the error of estimation by finding the difference between the estimated result and the exact result. This set of worksheets contains lessons, step-by-step solutions to sample problems, and both simple and more complex problems that students can use for independent practice. When finished with this set of worksheets, students will be able to estimate, then solve for the exact answer and determine the error of estimation. A prior understanding of the concept of rounding is required. These worksheets explain how to round and estimate length. Sample problems are solved and practice problems are provided.