1. 54 cents

2. Derek

3. 8 pencils, 60 jars

4. a = 3,    b = 5,     c = 1,     d = 7,     e = 6,     f = 2

5. 134 metres

6. The number 5

7. There are four possible answers: 22, 23, 24 or 25 blocks

8. Each word can be turned into a country by changing one letter; so your three answers should be CHILD (Chile)  LAPS (Laos)  and TIGER (Niger)

9. a. 2nd    b. Tasmania   c. Bill    d. romance

10. 40