How can i convert 84/75 to decimal

To convert 84/75, you can divide the numerator by the denominator. then, you get 1.12.
      __1.12__
75/  84.00
      -75  ↓↓
       __  ↓↓
           90↓
          -75↓
         ___↓
            150
           -150
         
                0

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