Lesson: Estimating Sums and Differences: Numbers up to 1,000,000 Mathematics • 4th Grade
In this lesson, we will learn how to use rounding and compatible numbers to estimate sums and differences of numbers up to six digits.
Estimate by rounding the two numbers to the nearest hundred thousand.
Estimate the result of the following by rounding both numbers to the nearest thousand:
The second-longest bridge in the world, located in Taiwan, is 157,317 m, and the length of the Yanshi bridge in China is 28,543 m. Estimate the difference between the lengths of the two bridges by rounding the two numbers to the nearest thousand.