A.
1. 5/6 ÷ 2/9
2.3/8 ÷ 1/2
3.6/5 ÷ 2/9
4.3/5 ÷ 1/2
5.1/3 ÷ 1/4
6.7/6 ÷3/4
7.5/6 ÷ 1/3
8.1/3 ÷ 1/2
9.2/3 ÷ 1/4
10.4/5 ÷ 7/10

b.
1. 15 3/4 ÷ 5 1/4 =
2.15 3/4 ÷ 2 1/3 =
3.9 3/4 ÷ 3/4

c.
1. 0.9802 + 0.3145
2.. 0.8235 + 0.5323
3...0.7509 + 0.9851
4..0.7536 + 0.1601
5.0.6765 + 0.4345
6.12.6780 - 10.3469
7.0.7452 - 0.4765
8.25.563 -13.2412
9.463.1291 - 402.1087
10.0.7546 - 0.4278

d.
1. 0.048 + 0.0275 + 0.049
2. 0.78 + 0.3621 + 0.691 + 0.3
3. 0.349 + 0.7005 + 0.2421
4. 0.2034 + 0.16
5. 0.133 + 0.0857