* Numbers which have no common measure but unity are said to be prime to each other.

62

7. 3.

14. 61.

27. £58, 78. 91d.

28. £732, 68. 2d.

29. 25 cwt. O qrs. 121 th.

30. 122 cwt. 0 qrs. 195 lb.

SUBTRACTION OF FRACTIONS.