Question

1.Calculati frupand convenabil factorii inmultirii :
( 8x 7 ) x 25 =
7 x 38 x 4 =
8 x (7 x25 ) =
68 x 4 x8 =
8x7 x 25 =
132 x 3 x 5 =
2. Grupati in moduri diferite operatiile de inmultire :
5 x 13 x 4 =
37 x 2 x 15 =
125 x 4 x 25 =
3. Efectuati
2 x 4 x 6 =
3 x 2 x 18 =
27 x 2 x 4 =
84 x ( 2 x 5 ) =

4. Efectuati apoi scrieti unul din semnele < = >
2 x 18 x 5 ? 18 x 5 x 2
4 x 85 x 3 ? 5 x 58 x 4
27 x 3 x 6 ? 27 x 2 x 9
2 x 143 x 0 ? 3 x 98 x 0
5. Completati prin incercari, astfel incat operatiile matematice sa fie adevarate
2x 3 x ? < 32
3 x ? x 4 < 40
? x 2 x 8 < 60

Answer 1

56 x 25 = 1400
28 x 34 = 952
175 x 8 = 1400
68 x 32 = 2176
56 x 25 = 1400
132 x 15 = 1980
 2 .20 x 13 =260
30 x 37 = 1110
125 x 100 = 1250

3
8 x 6 = 48
6 x 18 = 108
27 x 8 =216
84 x 10 =840