Yours in pedantry
The article about calculators in primary school maths tests ("Calculator ban does not compute, say experts", 16 November) reports that Elizabeth Truss wants calculators banned as "they breed a reliance on technology to complete basic sums".
A sum is the total amount resulting from the addition of two or more numbers, amounts, or items. The correct term for maths questions is equation; this would include addition, subtraction, division and multiplication operations.
Dean Linkhorn, Headteacher, Woolley Wood School, Sheffield.