Final answer:
The estimated solution of 7,390.7 - 0.874 is approximately 7,390 by rounding the numbers to the nearest whole number.
Step-by-step explanation:
To estimate the solution of 7,390.7 - 0.874, you can round the numbers to make the calculation simpler. You can round 7,390.7 to 7,391 and 0.874 to 1, which gives us an estimate of 7,391 - 1 = 7,390. This estimation process is often used in mathematics to quickly approximate answers without a calculator.