Question

Round off the nearest tens and find the actual and estimate sum of 126 and 311

Answer 1

126=130,311=310
130+310=440

Answer 2

Solution :-

While rounding off to the nearest ten, if the digit at the units place is between 0 to 4 i.e., < 5 then the unit digit is replaced by '0'.

If the digit at the units place is between 5 to 9 i.e., > or 5 but less than 10, then the units digit is replaced by '0' and the digit at tens place is increased by 1.

Now, we have to round off 126 and 311 to nearest tens place and find out the actual and estimated sum.

Actual sum of 126 and 311

⇒ 126 + 311 = 437

Estimated sum of 126 and 311

126 rounded off to nearest tens place becomes 130

311 rounded off to nearest tens place becomes 310

⇒ 130 + 310 = 440

So, estimated sum of 126 and 311 is 440

Answer.