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คำแนะนำสำหรับนักเรียน
Arrange the eight dominoes to form a four-by-four square in which the number of pips in each row and column is the same.
บันทึกสำหรับครู (นักเรียนไม่เห็น)
The domino images cannot be locked to size because they need to be able to rotate them. If one is accidentally resized, immediately hit ctrl-z (command-z on Mac) or the undo button. Enjoy! Thank you to https://mathequalslove.net/
