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)900+500=1400
b)800+400=1200
c)11200+3500=14700
d)17700+13600=31300
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