Marissa would like to estimate the sum of 6821 + 4963. Explain how Marissa could use rounding to make an estimate.

Marissa would round 6,821 to 7,000 and 4,963 to 5,000. Then she would add 7,000 and 5,000 and get 12,000.

The exact answer would be 11,784.

First, round 6821 which is 6800 because the number next to the hundreds place (2) is less than five so you add zeros, 6800. Now, round 4963 which is 5000 because the number next to 9 is 6, which is greater than 5 so the nine turns to ten, it adds it to the thousands place, 5000. Lastly, add 6800 and 5000 equals 11800.

I explained so much and I hope you understood.