Question

462. Calculează după model.
a) 15 x 11 b) 31 x 11
64 x 11
75 x 11
c) 45 x 11
85 x 11​

Answer 1

Răspuns:

15×11=

=15×(10+1)

=(15×10)+(15×1)

=150+15

=165

31×11=

=31×(10+1)

=(31×10)+(31×1)

=310+31

=341

64×11=

=64×(10+1)

=(64×10)+(64×1)

=640+64

=704

75 x 11=.

=75×(10+1)

=(75×10)+(75×1)

=750+75

=825

45 x 11=

=45×(10+1)

=(45×10)+(45×1)

=450+45

=495

85 x 11=

=85×(10+1)

=(85×10)+(85×1)

=850+85

=935