16÷0.25= 1.5× 2 5 = 5 7 ÷ 10 21 = 2-1 5 11 + 6 11 = 5 9 ×1.8

16÷0.25=64 1.5×
2
5 =0.6
5
7 ÷
10
21 =1.5 2-1
5
11 +
6
11 =
12
11

5
9 ×1.8 =1
5
12 ÷
5
6 =0.5 1-
3
13 =
10
13 2.25+ 1
1
2 ×
1
2 =3
1
3
5 ×5 =8
1
4 ÷2.5% =10 1
1
2 +2
3
5 =4.1 1
3
4 ×1
1
4 ÷1
3
4 =1
1
4