1. Rearrange the formula to make a the subject b = 5a + 21 b – 21 = 5a b – 21 = a -21 ÷5 5 This means we want to rearrange the formula so it says a = Our answer should say... a = b – 21 5

2. Rearrange the formula to make t the subject h = 13 + 7t h – 13 = 7t h – 13 = t -13 ÷7 7 This means we want to rearrange the formula so it says t = Our answer should say... t = h – 13 7

3. Exercise One Rearrange each formula to make s the subject 1.u = 11s + 3 2.w = 8s + p 3.q = 3a + 4t 4.7s + m + t = l 5.a = 3(s + 4) 6.4 = g(s – 7) 7.22 + 5s = g 8.r = q – 3s Hint: You need to expand the brackets first

4. Rearrange each formula to make s the subject 1.u = 11s + 3  s = u - 3 2.w = 8s + p  s = w – p 3.q = 3s + 4t  s = q – 4t 4.7s + m + t = l  s = l – m – t 5.a = 3(s + 4)  s = a - 12 6.4 = g(s – 7)  s = 4 + 7g 7.22 + 5s = g  s = g - 22 8.r = q – 3s  s = q - r 11 8 3 7 3 g 5 3

5. Rearrange the formula to make v the subject e = 3v + t 5e = 3v + t 5e – t = 3v 5e – t = v - t x5 This means we want to rearrange the formula so it says v = Our answer should say... v = 5e – t 3 5 3 ÷3

6. Rearrange the formula to make p the subject m = p + n m - n = p 2(m – n) = p - n x2 This means we want to rearrange the formula so it says p = Our answer should say... p = 2(m – n) 2 2

7. Make x the subject in each of these formulae: 1. 2. 4. 3. 5. 6. 7. 8. 9.