Add: 57 + 86

Question

Estimate: 57 + 86
_ + 90 = 150
We can expect the estimate to be _ than the actual sum.
Set the problem up vertically. Line up the numbers by place value: ones over ones and tens over tens.
Add:
7 + 6 = _
10 + 50 + 80 = _
The total in the tool is _.
This is close to our estimate of 150.

Summerize this

Answer 1

To solve the problem:

1. Add: 57 + 86.
2. Estimate: The estimate for 57 + 86 is calculated by rounding the numbers to the nearest ten (60 + 90 = 150).
3. Equation: In the equation _ + 90 = 150, we find that _ equals 60.
4. We can expect the estimate to be higher than the actual sum.
5. Vertical setup: Arrange the numbers by place value:

     57
   + 86
   ------
   

6. Add the digits: In the ones place, 7 + 6 = 13 (write down 3 and carry over 1). In the tens place, 10 + 50 + 80 = 140.
7. The total is 143.
8. This is close to our estimate of 150.