Estimate the sum or difference as indicated:
567+78 (rounding off to the nearest ten)

Answer

To estimate the sum of 567 and 78 by rounding off to the nearest ten, we can follow these steps:

### Step 1: Round 567 to the nearest ten
- Look at the last digit (unit place) of 567, which is 7.
- Since 7 is greater than or equal to 5, we round up the tens place.
- The tens place of 567 is 6. Adding 1 to it gives us 7.
- Therefore, rounding 567 gives us:
\[ 567 \approx 570 \]

### Step 2: Round 78 to the nearest ten
- Look at the last digit of 78, which is 8.
- Since 8 is also greater than or equal to 5, we round up the tens place.
- The tens place of 78 is 7. Adding 1 to it gives us 8.
- Therefore, rounding 78 gives us:
\[ 78 \approx 80 \]

### Step 3: Add the rounded numbers
- Now, we add the rounded numbers together:
\[ 570 + 80 \]
- Performing the addition:
- Start with the ones place: 0 + 0 = 0
- Then the tens place: 7 + 8 = 15 (write down 5 and carry over 1)
- Finally, the hundreds place: 5 + 1 (from carry) = 6
- So, the estimated sum is:
\[ 570 + 80 = 650 \]

### Final Answer:
The estimated sum of 567 and 78, rounded to the nearest ten, is **650**.

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