Question

239. Observă modul de calcul, apoi află produsele înmulţirilor:
21 x 14 = {21 10) + (21 x 4)
= 210 + 84 = 294
a) 36 x 15;
b) 113 x 34 c) 52 x 17;
38 x 29:
391 x 17;
66 x 25;
76 x 75;
206 x 29,
73 x 23;
d) 119 x 16;
245 x 21;
327 x 35.

Answer 1

Răspuns:

36×15=36×10+36×5=360+180=540

113×34=113×30+113×4=3390+452=3842

52×17=52×10+52×7=520+364=884

38×29=38×20+38×9=760+342=1102

391×17=391×10+391×7=3910+2737=6647

66×25=66×20+66×5=1320+330=1650

76×75=76×70+76×5=5320+380=5700

206×29=206×20+206×9=4120+1854=5974

73×23=73×20+73×3=1460+219=1679

119×16=119×10+119×6=1190+714=1904

245×21=245×20+245×1=4900+245=5145

327×35=327×30+327×5=9810+1635=11445