Question

Find the estimated
Sum by rounding off to the
nearest tens and also find the actual sum.
I) 167 + 259 =
2) 364 + 589=
3) 769 + 556 =​

Answer 1

Answer:

1) 167+259

on rounding off,

170+260=430

2) 364+589

on rounding off,

360+590=950

3) 769+556

on rounding off,

770+560=1330

NOTE: You can also add first and then round off. But rounding off first is what I recommend.

Answer 2

Actual sum

1)167+259=426

2)364+589=953

3)769+556=1325

after rounding off to the nearest tens

1)170+260=430

2)360+590=950

3)770+560=1330

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