> as lemmas

1911 S. S. Colvin Learning Process iii. 51 Much of it might function equally well for the reading habit, or the number-work habit.

1962 Listener 15 Mar. 469/2 Earlier attempts to teach ‘number work’ are premature and cannot lead beyond the learning of meaningless rules.

1984 V. Day in Listener 19 Apr. 37/1 They are becoming used increasingly..for teaching the first and most basic subjects (numberwork, letter recognition, etc.).