How to spell numbers in English

How to spell numbers in English. Do the following calculations and fill in the right numbers in English.
1. Two plus is nine.
2. Three plus eight is .
3. Four plus nine is .
4. plus eight is fifteen.
5. Fourteen plus six is .
6. Ten plus is twenty-five.
7. Twenty five plus is seventy five.
8. Two plus ten is twelve.
9. Eleven plus is twenty eight.
10. Fourteen plus is fifty four.
11. Twenty three plus eighteen is .
12. Fifty six plus six is .
13. plus seven is twelve.
14. Eighteen plus thirty seven.
15. Ten plus five is .
16. plus twenty six is fifty.
17. Eighteen plus twelve is .
18. Thirty one plus forty two is .
19. Fifty plus thirty is .
20. Thirty three plus five is .