51÷0.25=51×4

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51÷0.25=51×451÷0.25=51×451÷0.25=51×40.25=25/100=1/451÷(1/4)=51*4

51÷0.25=51×4
51÷0.25=51×4

51÷0.25=51×4
0.25 = 25/100 = 1/4
51 ÷ (1/4) = 51 *4