book Maths Puzzle Numerical Ability

Multiply or Divide
1-2/3z </u>
z-4/9z</PRE>

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book Other Question

Leila needs to make a poster that is 1m by 4.5m for the big game. the cost of the paper is $3.75. Later she needs another poster with dimensions 0.5m by 2.25m. What is the paper for this poster likely to cost? How do I mulitply in base seven....366 * 34? i know 6*4 base 7 is 33 but what do i do with the next 6*4+3??? I need help.

Thanks!