Final answer:
To estimate the subtraction of 493.078 and 13.861, round each number to the nearest whole number. Subtract the rounded numbers to get the estimated answer of 479.
Step-by-step explanation:
To estimate the subtraction of 493.078 and 13.861, you can round each number to the nearest whole number. When you round 493.078 to the nearest whole number, you get 493.
And when you round 13.861 to the nearest whole number, you get 14.
Subtracting these rounded numbers, 493 - 14, gives you an estimated answer of 479.