Tanpa menggunakan alat hitung,tentukan 102 × 98 dan 1003 × 97

102 x 98
= (100 + 2) x 98
= 100 x 98 + 2 x 98
= 9800 + 196
= 9996

1003 x 97
= (1000 + 3) x 97
= 1000 x 97 + 3 x 97
= 97000 + 291
= 97291

102×98 =9996
1003×97=97291