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.

Fill in the blanks!

Answer 1

Let's fill in the blanks step by step.

1. Predicting the sum by rounding:
   • Round 593 to 600.
   • Round 788 to 800.

So, we have: 600 + 800 = 1,400

Since both addends were rounded up, the estimate will be greater than the actual sum.

2. Adding to fill the next blank:

   • To get from 3 to 11, we need to add 8.

3. Next calculation:

   • 10 + 90 + 80 = 180 (This part is already complete).

4. Now for the last equation:

   • To find what we need to add to 500 and 700 to get 1,300,
   • We can set up the equation: 500 + 700 + x = 1,300.
   • This simplifies to 1,200 + x = 1,300.
   • Thus, x = 1,300 - 1,200 = 100.

5. The last part, "The sum is _.":

   • The accurate sum of 593 + 788 is calculated as: 593 + 788 = 1,381.

Putting it all together, we have:

• First blank: 800
• Second blank: 8
• Third blank: 100
• The sum is 1,381.

So the completed statement would read:

593 + 788 First, let's predict our sum. Round both numbers to the nearest hundred. 593 + 788 600 + 800 = 1,400 because both addends were rounded up, the estimate will be greater than the actual sum. Add: 3 + 8 = 11 10 + 90 + 80 = 180 100 + 500 + 700 = 1,300 The sum is 1,381. That is close to our estimate of 1,400, so it appears that our answer is reasonable.