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GCSE Maths: Equations 18 rows�� Square the base radius of the cone and multiply by pi. Multiply your answer by the Missing: java. Edexcel GCSE () Maths: need-to-know formulae myboat284 boatplans Pythagoras For a right-angled triangle, a2 + b2 = c2 sin xo =, cos xo =, tan xo = Quadratic equations The solutions of ax2 + bx + c = 0, where a ? 0, are given by x = Circles Circumference = C ? ? diameter, C = ?d Circumference = 2 ? ? ? radius, C = 2?r. In the algebra section, we looked at how we can use letters as numbers and how to find their values. There are times, however, when life gets a little harder: x + y = We cannot say what x and y are in All Equations For Maths Gcse Question the equation above because there are an infinite number of possibilities. x = 1, y = 24 x = 21, y = 4 etc.. In general, a single equation with two unknowns (we don't know x and y in this.
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These exercises are all rather long and the idea is not necessarily to use them in their entirety. Because they have all been typed up in in Word, teachers will easily be able to edit the exercises or cut and paste particular questions to use as examples in class. Most exercises include answers. I will edit this post if anything is updated. For each exercise listed below I have included a small extract so you can preview the type of questions covered.

Very Easy Equations four exercises - with thanks to Caroline Beale cbealemaths. Easy Literal Equations - with thanks to Sandra Douglas mathsbox1. Miscellaneous Simultaneous Equations All Equations For Maths Gcse Online Booking - with thanks to Fee Wilson fionajw. I hope this is useful. Thank you again to everyone who has worked on this.

And of course full credit to Sidney Trustram, the original author of these exercises which, 70 years on, are still making us think. Look out for my next posts in which I'll share exercises on simplifying algebra, expanding, factorising, writing algebraically and working with directed numbers. Labels: Algebra , History , Textbooks. Unknown 22 January at To calculate the rate of transpiration , you could measure the distance a bubble moves in a potometer over time.

Alternatively, you could measure the speed of product formation. For example, the rate of photosynthesis can be calculated by measuring the volume of oxygen produced over time or the number of oxygen bubbles produced over time. A trickier one is calculating the rate of All Equations For Maths Gcse Levels lipase-controlled reactions. Here, the product fatty acid leads to a drop in pH and therefore the change in pH over time can be used to work out the rate of reaction. You could measure the speed of reactant use, for example, by measuring a change in mass over time, including the drop in mass of compost material in decay reactions.

In all cases, the units for the rate will depend on the units used for time and the other variable. Search Close. Back to blog. Magnification You need to be able to rearrange this equation.

Estimates In the exam, you may need to estimate the size of a cell. There are two ways of doing this. Estimate the size of a cell � Method 1 This method works best under lower magnifications. Estimate the size of a cell � Method 2 A more accurate estimate of cell size can be found by using an eyepiece graticule. Estimate the population of a stationary species In the Biology GCSE exam, you may be asked to estimate the population of a species in a habitat.

For an estimate of the number of a plant species in a field , follow the steps below: Count the number of individuals of a species in each of 10 quadrats. Calculate the total number of individuals in Step 1 and then divide by 10 to work out the average number of the species in each quadrat.

Measure the area of the field length x width and then the area of a quadrat. Multiply the number of quadrats in Step 4 by the average number of the species you calculated in Step 2. Estimate the population of a moving species OCR only If you are following the OCR specification , you may be asked to estimate the population of a moving species. Percentage change The percentage change calculation is important in the context of the osmosis practical that is a requirement of all exam boards.

Apply the following formula: Efficiency An efficiency calculation is required in the context of biomass transfer through food chains. Use the following equation: Area of a circle This equation which you know from Maths will be necessary when analysing inhibition zones caused by antibiotics or antiseptics on bacterial growth.

Remember your ruler, keep a cool head and best of luck! Katie Ross. Sign up now. All rights reserved. Interested in a subscription?

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