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Bab Pola BilanganMatematika SMP Kelas VII
1 + 3 + 5 + ... + 97 + 99 = ?
(1 dan 90)
1 + 99 = 100
3 + 97 = 100
5 + 95 = 100
7 + 93 = 100
9 + 91 = 100
------- +
500
seluruh = (1 dan 90) + (10 dan 80) + (20 dan 70) + (30 dan 60) + (40 dan 50)
seluruh = 500 + 500 + 500 + 500 + 500
seluruh = 2.500