Answer:
I know you don't need these answers anymore but for the other people:
Explanation:
1. 0.008
2. 500
3. 0.00027
4. 0.000044
5. 2100
6. 1660000000
7. 0.0000000385
(And on big maths ideas for the other answers number 23 (9.725x10^6) = 9725000 and question 15 is 70,000,000.)
Hope you get 100% like I did :).