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five time: in themultiplication 2,3,4,6 12
13
The squares make a diagonal line.123456789101112112345678910111222468101214161820222433691215182124273033364481216202428323640444855101520253035404550556066121824303642485460667277142128354249566370778488162432404856647280889699182736455463728190991081010203040506070809010011012011112233445566778899110121132121224364860728496108120132144
http://www.mathsisfun.com/multiplication-table-bw.html this is a printable multiplication table. Multiplication doesn't change no matter what grade so just leave the chart as is.
It would depend on how the multiplication table is formatted, but assuming that you don't have any 1x columns or rows - so you start with 2x2 and go up to 12x12, then the numbers which are squares of prime numbers will appear only once: 2², 3², 5², 7², and 11², or {4, 9, 25, 49 and 121}.The only way you can get 4 is 2 x 2, or 1 x 4 or 4 x 1;9 is 3 x 3 or 1 x 9 or 9 x 1, etc.So if there is no 1x column/row, then those numbers will appear only one time.