Question

Drag the numbers to match each expression with the best estimate.

227. 4 + 213.5 __
513.9 - 46.1 __
348.2 + 62.8 __
637.9 - 206.3 __

410
460
430
440

Answer 1

Let's estimate each expression by rounding the numbers to the nearest ten or hundred to make the calculations simpler.

1. **227. 4 + 213.5**:
- Round to the nearest ten: 230 + 210 = 440.

2. **513.9 - 46.1**:
- Round to the nearest ten: 510 - 50 = 460.

3. **348.2 + 62.8**:
- Round to the nearest ten: 350 + 60 = 410.

4. **637.9 - 206.3**:
- Round to the nearest hundred: 640 - 200 = 440.

Now, we can match the estimates:

- 227.4 + 213.5 → **440**
- 513.9 - 46.1 → **460**
- 348.2 + 62.8 → **410**
- 637.9 - 206.3 → **430** (Note: this should actually be 430 by more accurate rounding to 600 - 200 = 400.)

So the best estimates would be:

1. **440**
2. **460**
3. **410**
4. **430**

Matches:
- 227.4 + 213.5 → 440
- 513.9 - 46.1 → 460
- 348.2 + 62.8 → 410
- 637.9 - 206.3 → 430