Question

Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens):

439 + 334 + 4,317

Answer 1

Rounding off to the nearest hundreds, 439, 334, and 4317 may be rounded off to 400, 300, and 4300 respectively.

    400
    300
+4300
  5000 

Rounding off to nearest tens, 439, 334, and 4317 may be rounded off to 440, 330, and 4320 respectively.

    440
    330
+4320 
  5090