Question

225. Grupează convenabil factorii, pentru a calcula rapid:
a) 2 x 490 x 5;
b) 360 x 50 x 2;
c) 2 x 313 x500

Answer 1

2 x 5 x 490 = 10 x 490 = 4900

2 x 50 x 360 = 100 x 360 = 36000

2 x 500 x 313 = 1000 x 313 = 313000

Answer 2

a) 2x5x490= 10x490= 4900
b) 50x2x360= 100x360= 36000
c) 2x500x313= 1000x313= 3130000