Add: 593 + 788

Question

First, let's predict our sum. Round both numbers to the nearest hundred.
593 + 788
600 + _ = 1,400
because both addends were rounded _, the estimate will be greater than the actual sum.
Add:
3 + _ = 11
10 + 90 + 80 = 180
_ + 500 + 700 = 1,300
The sum is _.
That is close to our estimate of 1,400, so it appears that our answer is reasonable.

Answer 1

Let's break down the calculations as you've outlined.

First, we round both numbers to the nearest hundred:

• 593 rounds to 600
• 788 rounds to 800

Now we can add the rounded numbers:

• 600 + 800 = 1,400

Now, let’s proceed with the exact addition of the original numbers:

• 593 + 788 = 1,381

Next, we can solve the blanks in your statements:

For the equation:

• 3 + _ = 11
  • To find the missing value:
    _ = 11 - 3 = 8

For the equation:

• 10 + 90 + 80 = 180
  • This one is already complete.

For the equation:

• _ + 500 + 700 = 1,300
  • To find the missing value:
    _ = 1,300 - 500 - 700 = 100

Putting it all together:

• The missing values are:
  • _ = 8
  • _ = 100

The final statements will read:

1. 3 + 8 = 11
2. 10 + 90 + 80 = 180 (already complete)
3. 100 + 500 + 700 = 1,300

Now, summarizing everything we found:

• The sum of 593 + 788 is 1,381.
• That is close to our estimate of 1,400, confirming that our answer is reasonable.