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Simple operation of 65 * 132-13 * 31-65 And 9999 * 4 + 1111 * 64 43*22+33*28
65*132-13*31-65=(5*13)*(4*31)-13*31-5*13=13*31(20-1)-5*13=13*(31*19-5)=13*596=7748
Simple calculation of 30 / 17 × 31
17 × 30 / 31
=17x(1-1/31)
=17x1-17x1/31
=17-17/31
=16 and 14 / 31
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