PERKALIAN CEPAT DUA BILANGAN DUA ANGKA YANG PULUHANYA 9 DAN SATUANYA SAMA

Contoh:
1. 98 x 98 = …..
= (98 – 2) x (98 + 2) + 22
= 96 x 100 + 4
= 9604
2. 99 x 99 =….
= (99 – 1) x (99 + 1) + 12
= 96 x 100 + 1
= 9801
3. 97 x 97 = ….
= (97 – 3) x (97 - 3) + 33
= 94 X 100 + 9
= 9409

Latihan:
1. 92 x 92 = …..
2. 93 x 93 = …..
3. 94 x 94 = …..
4. 95 x 95 = ….
5. 96 x 96 = …..