1.

(1) If 4 is the first square number, which is the fifth one? (2) If 3 is the first triangular number, which is the sixth one? (3) Write all the square numbers between 20 and 80. (4) Write all the triangular numbers between 20 and 80. (5) Write the greatest two-digit square numbers as well as triangular numbers. (6) Write the next three square numbers, 36, 49, 64,…….,(7) Write the next three triangular numbers 36, 45, 55,

Answer»

(1) 36 

(2) 28 

(3) 25, 36, 49, 64 

(4) 21, 28, 36, 45, 55, 66, 78 

(5) 81, 91 

(6) 81, 100, 121 

(7) 66, 78, 91



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