Summary
Contents
The author focuses especially on weaknesses in numeracy often observed in adults, and in teacher-trainees in particular.
Check-up 22: Mental Calculations, Division Strategies
Check-up 22: Mental Calculations, Division Strategies
Without resorting to a formal method like long division or a calculator, use a combination of mental calculations and informal jottings to find the number of pupils per teacher for each of these schools:
- School A: 252 pupils, 12 teachers
- School B: 805 pupils, 35 teachers
- School C: 785 pupils, 44 teachers
Discussion and Explanation of Check-up 22
We should be able to handle divisions of this level of difficulty without recourse to a calculator or formal written methods, such as long division. Informal methods are usually much easier than long division anyway. The calculations in this check-up illustrate some useful strategies.
For 252 ÷ ...