Estimate the value of 43 + 57 by rounding off each number to the nearest ten first.

Estimate the value of 182 + 256 by rounding off each number to the nearest ten first.

Estimate the value of 674 + 202 by rounding off each number to the nearest ten first.

Estimate the value of 93 + 138 + 29 by rounding off each number to the nearest ten first.

Estimate the value of 189 + 368 + 417 by rounding off each number to the nearest ten first.

Estimate the value of 67 + 449 by rounding off each number to the nearest hundred first.

Estimate the value of 897 + 236 by rounding off each number to the nearest hundred first.

Estimate the value of 2 639 + 4 878 by rounding off each number to the nearest hundred first.

Estimate the value of 4 609 + 2 375 + 212 by rounding off each number to the nearest hundred first.

Estimate the value of 3 560 + 1 425 + 990 by rounding off each number to the nearest ten first.