①0.88+0.22=1.1；②

4

5

-

1

3

=

7

15

；③4.2÷5.6=0.75；④

6

5

+

1

6

+

4

5

=2

1

6

；

⑤1.25×1.6×0.8=1.6；⑥6.03×3.9≈24；⑦

1

4

×8÷

1

4

×8=64；⑧0.375×0.625=

15

64

；

⑨1÷25%=4；⑩38%+1=1.38．