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+1+2+3+4.+79+80+81
Original formula = (1 + 81) * 81 / 2 = 3322
Arithmetic sequence formula (first term + last term) * number of terms / 2
5.5 * 4.8 + 5.2 * 5.5 calculated by simple method
Original formula = 5.5 × (4.8 + 5.2)
=5.5×10
=55
How to calculate 16.2 / 2.5 + 3.8 / 2.5 with simple method
16.2/2.5+3.8/2.5
=16.2*2\5+3.8*2\5
=2\5*(16.2+3.8)
=2\5*20
=8
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