adding and subtracting decimals
1.2+9.0
10.2
5.0+4.0
9.0
60.8+56.7
117.5
80.0+30.9
110.9
5.0+30.9
35.9
300.9+29.0
19.0+5.9
24.9
40.9+50.0
90.9
45.5+34.5
80.0
56.6+55.5
62.1
3.9-2.9
1.0
50.9-49.8
1.1
57.0-59.0
2.0
47.6-36.7
11.1
12.7-31.7
19.0
20.9-39.9
19.0
30.9-12.9
18.0
14.8-13.8
1.0
79.0-67.0
12.0
36.9-34.6
2.3
434.4-343.3
111.1
232.2-323.3
111.1
341.9-340.7
1.2
291.3-273.2
10.1
301.7-310.5
9.2