[quote=yna_16]my big problem is. i always sleep during our science time. soo boring. the conversions.. the kg to g .. blah.blah.blah.. [/quote] Find ways to make Science fun, you know, to avoid sleeping. If you look at it carefully, Science really is an interesting subject. Now. for my question. Hahah... [spoiler]I already answered the problems. I just need you guys to double check my answers. If I have any mistakes, kindly tell/explain to me what they are and what is the right answer. Thanks! Give the Base 10 number for each: 1. 541 (base 6) = 205 2. 1140 (base 5) = 170 3. 332 (base 4) = 62 4. 1122 (base 3) = 44 5. 1011 (base 5) = 131 6. 86 (base 9) = 78 7. 1234 (base 5) = 194 8. 3212 (base 4) = 230 9. 2112 (base 3) = 68 10. 654 (base 7) = 333 11. 1123 (base 5) = 163 12. 1005 (base 6) = 221 13. 207 (base 8) = 135 14. 1100 (base 2) = 12 15: 10011 (base 2) = 19[/spoiler] Anyone?