Digit Sum Spirals
Task 1
Digit-sum spiral for multiples of 3:
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Figure 1
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Task 2
This activity is an exploration of the images that result when digit-sums are found for the multiples of a given number, and then a “spiral” is drawn on a squared grid with the lengths of the lines determined by the numbers obtained as the digit-sums (Figure 1). Firstly, what is a digit-sum? Using 149 as an example: 1 + 4 + 9 = 14 and 1 + 4 = 5, so the digit sum of 149 is 5. To create a digit-sum spiral for multiples of 7:
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Figure 2
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