(This exercise enables students practise their addition, subtraction, multiplication and division while simultaneously learning a simple fact about medicinal plants.)

Work out the mathematical problems in the circles. Then, use the code to change your answers into letters in order to reveal a secret message about a drug.

Figure

CODE: 1=A, 2=B, 3=C, 4=D, 5=E, 6=F, 7=G, 8=H, 9=I, 10=J, 11=K, 12=L, 13=M, 14=N, 15=O, 16=P, 17=Q, 18=R, 19=S, 20=T, 21=U, 22=V, 23=W, 24=X, 25=Y, 26=Z. |

Answer: Quinine, from the bark of the cinchona tree, is used to fight malaria.