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Shocked my further maths class in #MathsToday by writing: 157 -138 ----- 2 -1 They were decidedly not impressed. #ALevelMaths #UKMathsChat

Understandably so. If you had written: 20-1 They would have applauded.

14/10/26, 10:58 pm1 repost1 like

The formatting in a post here doesn't quite convey it accurately. The columns all lined up so the 2 was clearly in the tens column.