View Answer & Explanation
In each triangle, add together the lower 2 digits, and multiply this by the top digit, to give the value written in the centre of the triangle.
As you move down, numbers follow the sequence of Square Numbers, from 36 to 121, subtracting 10 for the second number, 20 for the next, then 30 etc.
Working in columns, start with the top number, and subtract the number in the centre, to give the result in the bottom row.
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