trik perkalian 20an

Trik kali ini perkalian dari 21 sampai 25 dgn bilangan yang sama

21 x 21 = (20×20) + (1+1)x20 + 1×1 = 400 + 40 + 1 = 441
22 x 22 = (20×20) + (2+2)x20 + 2×2 = 400 + 80 + 4 = 484
23 x 23 = (20×20) + (3+3)x20 + 3×3 = 400 + 120 + 9 = 529

kalo 24 anda bisa lakukan sendiri kan , ternyata mudah mudah aja

trik ini hanya bagi mereka yang kesulitan dan berdaya ingat rendah

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