1、5.76+ 13.67+4.24+6.33

=(5.76+4.24)+( 13.67+6.33)

= 10+20

=30

Example 2, 37.24+23.79- 17.24

=37.24- 17.24+23.79

=20+23.79

=43.79

Example 3,4× 3.78× 0.25

=4×0.25×3.78

= 1×3.78

=3.78

Example 4: 125×246×0.8

= 125×0.8×246

= 100×246

=24600

Example 5, (2.5+ 12.5) × 40

=2.5×40+ 12.5×40

= 100+500

=600

Example 6, 3.68× 4.79+6.32× 4.79

=(3.68+6.32)×4.79

= 10×4.79

=47.9

Example 7.26.86× 25.66-16.86× 25.66

=(26.86- 16.86) ×25.66

= 10×25.66

=256.6

Example 8, 5.7× 99+5.7

= 5.7×(99+ 1)

=5.7× 100

=570

Example 9, 34×9.9

=34×( 10-0. 1)

=34× 10-34×0. 1

=340-3.4

=336.6

For example, 10,57×101.

=57×( 100+ 1)

=57× 100+57× 1

=5757