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

Question

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