Question

for each expression, estimate to decide whether the sum is closer to 800 or 900. closer to 800: 415 + 400; closer to 900: 605 + 292, 385 + 499; 605 + 212

Explanation:

Step1: Estimate 605 + 212

Round 605 to 600 and 212 to 200. Then $600 + 200 = 800$. But we can also do a closer estimate: 605 is 5 more than 600, 212 is 12 more than 200. So the actual sum is $600 + 200 + 5 + 12 = 817$.

Step2: Compare to 800 and 900

The distance from 817 to 800 is $817 - 800 = 17$. The distance from 817 to 900 is $900 - 817 = 83$. Since 17 < 83, it's closer to 800.

Answer:

Closer to 800