10 + 12 + 14 + 16 + 18 + 20 + 22 + 24 + 26 + 28 + 30 + 32 + 34 + 36 - 36 - 34 - 32 - 28 - 24 - 22 - 20 - 18 - 16 - 14 - 12 - 10 = ....
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10 + 12 + 14 + 18 + 20 + 22 + 24 + 26 + 28 + 30 + 32 + 34 + 36 - 36 - 34 - 32 - 28 - 24 - 22 - 20 - 18 - 16 - 14 - 12 - 10 = 56
(cara cepat menjumlahkannya antara yg (+) dan (-) yg angkanya sama tinggal di coret dan yg beda tinggal di jumlahkan)
*
jika menghitungnya satu-satu
10 + 12 = 22
22 + 14 = 36
36 + 16 = 52
52 + 18 = 70
70 + 20 = 90
90 + 22 = 112
112 + 24 = 136
136 + 26 = 162
162 + 28 = 190
190 + 30 = 220
220 + 32 = 252
252 + 34 = 286
286 + 36 = 322
322 - 36 = 286
286 - 34 = 252
252 - 32 = 220
220 - 28 = 192
192 - 24 = 162
162 - 22 = 146
146 - 20 = 126
126 - 18 = 108
108 - 16 = 92
92 - 14 = 78
78 - 12 = 66
66 - 10 = 56
jadi hasilnya adalah 56
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