Estimate each of the following by rounding off each number to nearest hundreds:
(a) 874 + 478
(b) 793 + 397
(c) 11244 + 3507
(d) 17677 + 13589
(a) Rounding off 874 to nearest hundred = 900
Rounding of 478 to nearest 100 = 500
900 + 500 = 1400
(b) Rounding off 793 to nearest hundred = 800
Rounding of 397 to nearest hundred = 400
800 + 400 = 1200
(c) Rounding off 11244 to nearest hundred = 11200
Rounding of 3507 to nearest hundred = 3500
11200 + 3500 = 14700
(d) Rounding off 17677 to nearest hundred = 17700
Rounding of 3507 to nearest hundred = 13600
17700 + 13600 = 31300