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How I solved the Challenge question2 : 4?2 X 74 = 33458

Going by the digit sums above equation can be written as –> ? X 2 = 4

so digit sum of the first number has to be 2 for the above equation to be true. Digit sum of the first number with already given numbers there is 6. If a 5 can be added, digit sum of it would become 11 thats equal to 2. So the smuged number in the first figure is 5.

452 X 74 = 33458

Still trying to understand Challenge question1.

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