This section uses some further approaches to rearranging formulae. The aim of rearranging is to manipulate the formula so that all the terms involving the letter you want is on one side of the equation, and everything else is on the. You are asked about the subject of a sample formula, and you are given practice problems. Changing the subject of a formula formulae ks3 maths. Usually the subject of a formula is on its own on the lefthand side.
Changing the subject of the formula maths4scotland. Changing the subject of a formula past paper questions 1 change the subject of the formula to p. You may wish to rearrange an equation, to change its subject as some equations may have more than one algebraic symbol that is an unknown. Change the subject of a formula subject of the formula worked. In each case, make the letter given at the end, the subject of the formula. Rearranging a formula is similar to solving an equation we must do the same to both sides in order to keep the equation balanced. Is the formula which gives interest, i, gained on a principal, p, invested at r% per annum for t years. All that changing the subject of the formula means is basically getting a letter on its own on one side of the equation.
Rearranging formulas worksheets questions and revision mme. This website and its content is subject to our terms and conditions. So, if you want to have a formula or rule that lets you calculate d, you need to make d, the subject of the formula. Changing the subject of a formula changing the subject of a formula is exactly the same as solving an equation. It is often useful to change the subject of a formula. We are going to learn how to change the subject of the equation where we only have to apply one.
Changing the subject of a formula algebraic formulae. Changing the subject of a formula squares and square roots duration. If playback doesnt begin shortly, try restarting your device. The formula on the right, is the rule, that tells you how to calculate the subject. In the form, we say that is the subject of the formula. The subject of a formula is the variable that is being worked out. To change the subject of a formula, begin with the variable to become the new subject, and apply inverse operation as for solving equations in the opposite order. The following video shows how to change the subject of the formula where the coefficient of x is negative. Read each question carefully before you begin answering it. Tes global ltd is registered in england company no 02017289 with its registered office. Changing the subject in complex formulae teaching resources. It can be recognised as the letter on its own on one side of the equals sign.
For example, i stands for current in the science formula and i stands for interest in the arithmetic formula. If the letter you are rearranging for is in a bracket, then you can approach the rearranging in one of two ways. Subject of the formula make the indicated letters the. Rearranging a formula set 1 questions question 2 make x the subject for each of the following formulas. Sometimes the same letter can stand for different quantities in different formulae. Pencil, pen, ruler, protractor, pair of compasses and eraser you may use tracing paper if needed guidance 1. Mathematics linear 1ma0 changing the subject of a formula. Subject of the formula make the indicated letters the subject of the formula in the following.