Choosing digits with the same tens and units difference gives 1-digit difference, like 1 and 2 (21–12 = 9). Class 5 Maths Mela Chapter 1 shows repeated subtraction gives 9 when digits are reversed. Class 5 Mathematics Maths-Mela Chapter 1 We ...
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If we interchange digits 1 and 7, we get 7,418 which is greater than 5,500. Class 5 Maths Mela Chapter 1: We the Travellers — I encourages trying multiple swaps to explore number value. class 5 Maths-Mela Mathematics Textbook Chapter 1 ...