Maths: Do it Right set 1 (WIP)

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Maths

General Mathematics

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strats

Last updated 10:08 PM on 5/13/26
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7 Terms

1
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What is the formula for “percentage increase”?

  1. Calcuate the difference between the two prices shown

  2. Divide the result by the original

  3. Multiply by 100

  4. Round up to what the question wants you to estimate (if there is no decimal place requirement, round up to the nearest whole number)

<ol><li><p>Calcuate the difference between the two prices shown</p></li><li><p>Divide the result by the original</p></li><li><p>Multiply by 100</p></li><li><p>Round up to what the question wants you to estimate (if there is no decimal place requirement, round up to the nearest whole number)</p></li></ol><p></p>
2
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What is the formula for percentage increase (2)?

(Increased price - original)/original X 100

<p>(Increased price - original)/original X 100</p>
3
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What is the formula for percentage decrease?

  1. Calculate the difference between the two prices (EXCEPT, Original must go first before the new price because common sense)

  2. Divide the result by original

  3. Multiply by 100

  4. Round up to what the question wants you to estimate (if there is no decimal place requirement, round up to the nearest whole number)

<ol><li><p>Calculate the difference between the two prices (EXCEPT, Original must go first before the new price because common sense)</p></li><li><p>Divide the result by original</p></li><li><p>Multiply by 100</p></li><li><p>Round up to what the question wants you to estimate (if there is no decimal place requirement, round up to the nearest whole number)</p></li></ol><p></p>
4
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What is the formula for percentage decrease (2)?

(Original - decreased price)/original X 100

<p>(Original - decreased price)/original X 100</p>
5
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How do you calculate GST in a question where it states to “calculate the cost pre-GST?”

  1. Calculate the difference (e.g. how much Joel paid - the amount he paid for certain products)

  2. Divide the result by 1.10 (the GST number)

<ol><li><p>Calculate the difference (e.g. how much Joel paid - the amount he paid for certain products)</p></li><li><p>Divide the result by 1.10 (the GST number)</p></li></ol><p></p>
6
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<p>What formula would you start with to solve this kind of question?</p>

What formula would you start with to solve this kind of question?

Simple Interest

<p>Simple Interest </p>
7
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<p>How would you continue solving this kind of question?</p>

How would you continue solving this kind of question?

  1. Subtract the deposit from the balance (in this case: RRP)

  2. Multiply the instalments together (quantity X $amount), in this case: 24 X 30

  3. That will be your interest (I).

  4. From the instalments, determine what the “t” or “n” amount will be (in this case, 24 months = 2 years. t or n = 2)

  5. Substitute the values in the equation

  6. Solve for the unknown value

  7. Once solved, multiply by 100

<ol><li><p>Subtract the deposit from the balance (in this case: RRP)</p></li><li><p>Multiply the instalments together (quantity X $amount), in this case: 24 X 30</p></li><li><p>That will be your interest (I). </p></li><li><p>From the instalments, determine what the “t” or “n” amount will be (in this case, 24 months = 2 years. t or n = 2)</p></li><li><p>Substitute the values in the equation </p></li><li><p>Solve for the unknown value</p></li><li><p>Once solved, multiply by 100</p></li></ol><p></p>