The khipu number system was a base ten, positional system much like Arabic numerals, encoding decimal digits with different knots for units and tens.
Each string represents a three-digit number with 'o'-knots for units digits and 'x'-knots for tens and hundreds digits.
The strings marked (i), (ii), (iii), (iv) and (v) represent the numbers 134, 366, 250, 055, and 805 respectively, calculated by summing the values.
The top string value, which groups four strings together, equals the sum of those strings, illustrating how the Incans recorded numerical data.
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