Squares

Question 2

Square 2 digits - T = 5

Answer 2

1. last 2 digits are U²
2. T²+U

Question 3

Square 2 digits - U = 5

Answer 3

1. last 2 digits = 25
2. Times T by (T+1) = xx25

Question 4

Square any 2 digit number

Answer 4

1. U² = last 2 digits
2. 2(T x U) *U 3. T² (+*)