Explications étape par étape :
A = 43 x 19
43 * 10 = 430
430 * 2 = 860
860 - 43 = 817
D = 101 x 53
100 * 53 = 5300
5300 + 53 = 5353
B = 28 * 31
28 * 10 = 280
280 * 3 = 840
840 + 28 = 868
E = 59 × 199
59 * 100 = 5 900
5900 * 2 = 11 800
11 800 - 59 = 11 741
C = 99 x 417
417 * 100 = 41 700
41700 - 417 = 41 283
F = 299 x 13
13 * 100 = 1300
1300 * 3 = 3900
3900 - 13 = 3887