Estimate each of the following products by rounding off each number to nearest tens:
(a) 87 × 32 (b) 311×113 (c) 3239 × 28 (d) 1385 × 789
(a) 90 × 30=2700 (b) 310×110=34100 (c) 3240 × 30=97200 (d) 1390 × 790=1098100
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