13.3
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
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
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
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.
879
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 the composite numbers between 1 and 50 is 936.
o.875