Well...
2.84 rounds to 3, and 3.21 rounds to 3. So 3 plus 3 is 6. The estimated sum is 6.
The actual answer is 6.05 so that is right.
13.3
1800
The estimated sum is 11 The actual sum is 10 and 19/24
The estimated sum is 11. The actual sum is 10 and 19/24
140 + 420 = 560
13.3
1800
The estimated sum is 11 The actual sum is 10 and 19/24
The estimated sum is 11. The actual sum is 10 and 19/24
14
140 + 420 = 560
nothing
Notice that each of the three numbers is rather close to 9,000. The estimated sum is 27,000.
Estimated 8 + 3 = 11 Actual: 10 and 19/24
8 + 3 = 11 is an estimate for 10 and 2/3
3874 + 1845 = 5719 is the actual sum. I'm not sure where the 'estimated sum' comes into it.
-106, -107, -108