Estimate the following products using general rule:
(a) 578 × 161 =
(b) 5281 × 3491 =
(c) 1291 × 592 =
(d) 9250 × 29=
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(a)=93058
(b)=18435971
(c)=764272
(d)=268250
(b)=18435971
(c)=764272
(d)=268250
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