=(45+54+ 1)+3 1

= 100+3 1

= 13 1

2.546+785- 146

=(546- 146)+785

=400+785

= 1 185

3.25x49x4

=25×4×49

= 100×49

=4900

4.8x(36x 125)

=8× 125×36

= 1000×36

=36000

5.0.7+3.9+4.3+6. 1

=(0.7+4.3)+(3.9+6. 1)

=5+ 10

= 15

6.8x4x 12.5x0.25

=(4×0.25)×( 12.5×8)

= 1× 100

= 100

7.2.7x4.8+2.7x5.2

=2.7×(4.8+5.2)

=2.7× 10

=27

8.905x99+905

=905×(99+ 1)

=905× 100

=90500

9. 13x 10.2

= 13×( 10+0.2)

= 13× 10+ 13×0.2

= 130+2.6

= 132.6