Multiply the number by itself
Use the formula: (n^2 = n times n)
For numbers ending in 5, multiply the first part by the next whole number and add 25
For numbers near 100, use ((100 pm a)^2 = 10000 pm 200a + a^2)
For numbers near 50, use ((50 pm a)^2 = 2500 pm 100a + a^2)
Break large numbers into parts and apply ((a+b)^2 = a^2 + 2ab + b^2)
Use repeated addition of odd numbers for whole-number squares
Memorize common squares for faster calculation