Question

diagonal method question 137 whole square

Answer 1

I tell you, a short trick
first you do squar of 7 49
after do multiple of 13 and 7
91
after that you do multiple of 7 and 13
01
after you do square of 13
169
after that you got that number
write begin at 169
169 91 91 49
= 169 182 49
169 186 9
do 18 plus 169
18769 it is your answer