Decimal word problems: add and subtract

Decide whether to add or subtract, then line up the decimal points.

1. One bottle of juice is 7.7 L and another bottle of juice is 3.2 L. How many L are there in total?
2. One plank is 9.7 m and another plank is 8.3 m. How many more m is the first one?
3. One plank is 4.2 m and another plank is 6.3 m. How many m are there in total?
4. One bag of flour is 4.6 kg and another bag of flour is 1.6 kg. How many more kg is the first one?
5. One plank is 11.8 m and another plank is 8.6 m. How many more m is the first one?
6. One parcel is 12.5 kg and another parcel is 11.6 kg. How many more kg is the first one?
7. One plank is 16.8 m and another plank is 13.6 m. How many m are there in total?
8. One bag of flour is 20.7 kg and another bag of flour is 19.36 kg. How many more kg is the first one?
9. One bottle of juice is 39.61 L and another bottle of juice is 3.1 L. How many L are there in total?
10. One bag of flour is 16.79 kg and another bag of flour is 29.4 kg. How many kg are there in total?
11. One plank is 42.25 m and another plank is 12.9 m. How many more m is the first one?
12. One bottle of juice is 25.2 L and another bottle of juice is 2.6 L. How many more L is the first one?
13. One bag of flour is 64.26 kg and another bag of flour is 42.3 kg. How many more kg is the first one?
14. One piece of ribbon is 23.153 m and another piece of ribbon is 89.35 m. How many m are there in total?
15. One plank is 23.059 m and another plank is 12.07 m. How many m are there in total?
16. One parcel is 99.996 kg and another parcel is 46.91 kg. How many kg are there in total?
17. One bottle of juice is 371.37 L and another bottle of juice is 530.8 L. How many L are there in total?
18. One plank is 709.613 m and another plank is 71.57 m. How many more m is the first one?
19. One plank is 743.147 m and another plank is 174.265 m. How many more m is the first one?
20. One bag of flour is 189.541 kg and another bag of flour is 75.55 kg. How many more kg is the first one?