Question

Calculeazza rapid dupa model folosind propriatatile inmultirii

Model: 28x75 egal 4x 7 x 3 x 25
egal ( 4x 25) x ( 7x 3)
egal 100x 21
egal 2.100
 a) 36 x 75
     24 x 75
     28 x 75
     36 x 25
     28 x 25

Answer 1

36x75=4x9x3x25=(4x25)x(9x3)=100x27=2700
24x75=4x6x3x25=(4x25)x6x3=100x18=1800
28x75=4x7x3x25=(4x25)x7x3=100x21=2100
36x25=4x9x25=(4x25)x9=100x9=900
28x25=4x7x25=(4x25)x7=100x7=700

Adica sa descompuni fiecare termen, sa-i grupezi convenabil, astfel incat sa-ti fie usor sa faci inmultirile fara a utiliza un calculator.

Answer 2

a)36*75=6*6*3*25=
(6*25)*(6*3)=
150*18=2700
b)24*75=4*6*3*25=
(4*25)*(6*3)=
100*18=1800
28*75=7*4*3*25=
(4*25)*(7*3)=
100*21=2100
36*25=6*6*5*5=
(6*5)*(6*5)=
30*30=900
28*25=4*7*5*5=
(4*5)*(5*7)=
20*35=700