FAMILY FUN
Write the nine digits in order, and beneath them write' them in reverse order, thus : 123456789 987654321 Any two in succession will add with the two directly below them to 20, and so on, so that the total sum will be 1,111,111,110. If any two digits and the two directly below are added diagonally, as — 34 76 One pair will always add to 9 and the other to 11. If this is done when three digits are taken in each line and the addition is done after the same fashion — 234 876 combining the left hand upper with the right hand lower, the sums will always be 8, 10, and 12. When four are used in the same manner, the sums are 7, 9, 11, and 13. Similar results may be obtained with any combination up to the entire nine on each row where the sums are all the even numbers from 2 to 18.
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https://paperspast.natlib.govt.nz/periodicals/NZT19090211.2.71
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New Zealand Tablet, Volume XXXVII, Issue 6, 11 February 1909, Page 238
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157FAMILY FUN New Zealand Tablet, Volume XXXVII, Issue 6, 11 February 1909, Page 238
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