# Worksheet: Estimating Sums and Differences: Numbers up to 1,000,000

In this worksheet, we will practice using rounding and compatible numbers to estimate sums and differences of numbers up to six digits.

**Q1: **

Estimate by rounding the two numbers to the nearest hundred thousand.

**Q2: **

Estimate the result of the following by rounding both numbers to the nearest thousand:

**Q3: **

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.

**Q4: **

The population of Delaware, a state in the United States, was 976,171 in 2018 and 876,794 in 2008. Estimate the increase of the population between the two years by rounding the two numbers to the nearest thousand.

**Q5: **

Estimate by rounding the two numbers to the nearest ten thousand.