Question

Identify the numbers whose square would end with 9 (1) 123(2) 77(3) 82(4) 109

Answer 1

Answer:

123²= 1476 so, nope

77²=5929, yes

82²=6724 so, nope

109²= 11,881 so, nope

the only number whose square will be end with 9 is 77

Answer 2

Answer:

123 and 77 is the correct answer

Step-by-step explanation:

simply by squaring the last digits of each no. we can find

1) 123 its last digit is 3 square if 3 is 9

2) 77 its last digit is 7 , square of 7 is 49

3) 82 its last digit is 2, square of 2 is 4

4) 109 its last digit is 9 , square od 9 is 81

we can see in case 1 and 2 lasst digits of square is 9 hence opt 1 and 2 square will end with nine !