Round to the nearest ten thousand. Use the number line to model your thinking.
a. 35,124 rounded to the nearest ten thousand is
b. 981,657 rounded to the nearest ten thousand is
Round to the nearest hundred thousand. Use the number line to model your thinking.
a. 89,678 rounded to the nearest hundred thousand is
b. 999,765 rounded to the nearest hundred thousand is
Estimate the sum by rounding each number to the nearest hundred thousand. 257,098 + 548,765 ≈ __________