1. © T Madas Formula Practice

2. © T Madas Paul’s age equals Nick’s age, plus 4 P = N + 4 Jim’s age equals Maria’s age, times 2 J = M x 2 J = 2M Marc’s age equals his dad’s age, divided by 3 M = d ÷ 3

3. © T Madas The total cost of books if they are £4 each c = 4b The total weight of boxes weighing 5 kg each t = 5 x b t = 5b The share when the prize money is divided equally between 4 people s = p ÷ 4 c = b x 4

4. © T Madas The total video recording time of 3 cartoons lasting c minutes each and a soap lasting 55 minutes t = 3c + 55 t = 3 x c + 55 The total video recording time of 4 documentaries at d minutes each and a film lasting f minutes t = 4d + f t = 4 x d + f

5. © T Madas The total cost of 7 sweets at s pence each and 2 drinks at d pence each c = 7s + 2d c = 7 x s + 2 x d The total cost of s sweets at p pence each and d drinks at 50 pence each c = sp + 50d c = s x p + d x 50

6. © T Madas Practice on Writing Formulae

7. The cost of 3 drinks at s pence each The cost of 5 drinks at s pence each The cost of n drinks at 40 pence each The cost of n drinks at 50 pence each The cost of n drinks at s pence each c = 3 x s c = 3s c = 5 x s c = 5s c = n x 40 c = 40n c = n x 50 c = 50n c = n x s c = ns

8. © T Madas The cost of 2 pens at s pence each The cost of 7 pens at s pence each The cost of n pens at 30 pence each The cost of n pens at 50 pence each The cost of n pens at s pence each c = 2 x s c = 2s c = 7 x s c = 7s c = n x 30 c = 30n c = n x 50 c = 50n c = n x s c = ns

9. © T Madas The cost C, of n pencils at 30 pence each The recording time on a video T, of 3 films, each f minutes long The length of a traffic jam L, of 30 cars each m metres long The total cost C, of 3 pens at r pence each and 2 pencils at s pence each c = n x 30 c = 30n T = 3 x f T = 3f L = 30 x m L = 30m C = 3 x r + 2 x s C = 3r + 2s

10. © T Madas The cost C, of n books at £ 5 each The recording time on a video T, of 3 cartoons, each c minutes long The length of a traffic jam L, of 10 cars each m metres long The total cost C, of 2 pens at r pence each and 5 pencils at s pence each c = n x 5 T = 3 x c L = 10 x m C = 2 x r + 5 x s c = 5n T = 3c L = 10m C = 2r + 5s

11. © T Madas Quick Test on Writing Formulae

12. The cost of 3 drinks at s pence each The cost of 5 drinks at s pence each The cost of n drinks at 40 pence each The cost of n drinks at 50 pence each The cost of n drinks at s pence each c = 3 x s c = 3s c = 5 x s c = 5s c = n x 40 c = 40n c = n x 50 c = 50n c = n x sc = n x s c = ns

13. © T Madas The cost of 2 pens at s pence each The cost of 7 pens at s pence each The cost of n pens at 30 pence each The cost of n pens at 50 pence each The cost of n pens at s pence each c = 2 x s c = 2s c = 7 x s c = 7s c = n x 30 c = 30n c = n x 50 c = 50n c = n x sc = n x s c = ns

14. © T Madas The cost C, of n pencils at 30 pence each The recording time on a video T, of 3 films, each f minutes long The length of a traffic jam L, of 30 cars each m metres long The total cost C, of 3 pens at r pence each and 2 pencils at s pence each c = n x 30 c = 30n T = 3 x f T = 3f L = 30 x m L = 30m C = 3 x r + 2 x s C = 3r + 2s

15. © T Madas The cost C, of n books at £ 5 each The recording time on a video T, of 3 cartoons, each c minutes long The length of a traffic jam L, of 10 cars each m metres long The total cost C, of 2 pens at r pence each and 5 pencils at s pence each c = n x 5 T = 3 x c L = 10 x m C = 2 x r + 5 x s c = 5n T = 3c L = 10m C = 2r + 5s

16. © T Madas