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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i) Interchanging 0 and 5 gives 15,093. ii) Interchanging 1 and 5 gives 50,193. Class 5 Maths Mela Chapter 1: We the Travellers — I shows how digit rearrangement can change a number’s size significantly. Class 5 Mathematics Maths-Mela We the ...