【正文】
ii iii a b c 2 Put the number 2 in Square ai. 3 Put the number 4 in Square aiii. 4 Put the number 5 in Square bii. 5 Put the number 8 in Square ciii. i ii iii a b c 6 Now discuss with your partner and arrange the rest of the numbers between 1 and 9 (1, 3, 6, 7 and 9) in the square so that when you add any of the 3 numbers from top to bottom, from left to right, or from corner