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
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.
919
13.3
330 + 420 + 140 = 890
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
nothing
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.
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
The sum of 827 and 138 is 965.