Question

Add: 593 + 788
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.