1) Take note that Mrs Tan used the cloth from of the cloth that she bought. Hence the ‘cloth left = bought - used’.
2) For addition and subtraction of fractions, make sure you convert the terms to the common denominator first. The common denominator is usually the multiple of the original denominators. In this case, the common denominator is 5 x 2 = 10. Watch this video to understand better: https://youtu.be/N-Y0Kvcnw8g
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