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83×28
=83×4×7
=(80+3)×4×7
=(80×4+3×4)×7
=(320+12)×7
=332×7
=(300+30+2)×7
=300×7+30×7+2×7
=2100+210+14
=2100+224
=2324
=83×4×7
=(80+3)×4×7
=(80×4+3×4)×7
=(320+12)×7
=332×7
=(300+30+2)×7
=300×7+30×7+2×7
=2100+210+14
=2100+224
=2324
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