Estimate each sum to the nearest ten :
`(43+78)`

Answer

To estimate the sum of \(43 + 78\) to the nearest ten, we will follow these steps:

### Step 1: Round 43 to the nearest ten
- Look at the ones place of 43, which is 3.
- Since 3 is less than 5, we round down.
- Therefore, 43 rounds to 40.

### Step 2: Round 78 to the nearest ten
- Look at the ones place of 78, which is 8.
- Since 8 is greater than 5, we round up.
- Therefore, 78 rounds to 80.

### Step 3: Add the rounded numbers
- Now we add the rounded numbers:
\[ 40 + 80 = 120 \]

### Final Answer
The estimated sum of \(43 + 78\) to the nearest ten is **120**.

---