For all numerical questions, make sure your answers consist of three components clearly:
1) Formula
2) Substitution
3) Result with unit
Final Answer must be in decimal. No fraction is allowed.
Intermediate answer can be expressed in fraction and when you substitute using fraction, the answer can even be more accurate.
Bring calculator, long ruler and mathematical sets
All diagram must be drawn using pencil (and ruler)
__________________________
You must include the subject of the formula.
Refer also the following to learn about how to change the subject of the formula.
http://www.mathsisfun.com/algebra/equation-formula.html
http://www.studyit.org.nz/subjects/maths/math2/6/subjectcontent/rearrangefrmla.html
http://www.bbc.co.uk/schools/gcsebitesize/maths/algebra/formulaehirev1.shtml
___________________________
On accuracy:
- How a measurement of 2 cm using a metre rule should be written.
- Should it be written as 2 cm, 2.0 cm, 2.00 cm or 2.000cm?
- The correct answer should be 2.0 cm because of the precision of the instrument used.
- If we are using vernier caliper or micrometer, then the respective answer should be 2.00 cm and 2.000 cm.
Emphasise to students the importance of writing the zeros, if necessary, to indicate that the last figure written is significant with respect to the precision of the instrument (i.e. the instrument can measure the length up to that precision.)
______________________
On final result
Final result must be expressed in decimal instead of fraction
Intermediate answer (not the result answering to the questions) can be in fractions.
When asked to give ratio, the result must be in decimal as well.
______________________
Conversion
Conversion can be tricky. Please understand the explanation in the notes given to you.
For example:
1 g/cm3 = 1 000 kg /m3
1 m3 = 1000000 cm3
Similarly 1 m2 = 100 cm2 ?
Answer is NO! 1 m2 = 100 x 100 cm2
___________________________
1 N/m2 = 1 Pa
But
1 N/cm2 is NOT equal to 1 Pa