Question

Efectueaza dupa model :
12×7=(10×7)+(2×7) =70+14=84:modelul
13×6
34×8
5×68.

72×3
28×2
9×75

Answer 1

13 × 6 = (10 × 6) + (3 × 6) = 60+18 = 78
34 × 8 = (30 × 8) + (4×8) = 240+32 = 272
5 × 68 = (60 × 5) + (8×5) = 300+40 = 340

72 × 3 = (70 × 3) + (2×3) = 210+6 = 216
28 × 2 = (20 × 2) + (8×2) = 40+16 = 56
9 ×75 = (70 × 9) + (5×9) = 630+45 = 675