You will need
- - multiplication tables;
- - table of squares of two-digit numbers;
To find the square of any number is sufficient only that number multiplied by itself. Example 1. 6*6 =36; 4*4 = 16; 7*7 = 49. The product of the numbers to 10, one digit in the table, familiar to all from elementary school: multiplication table. On the diagonal you can see the squares of the numbers: 1*1=1, 2*2=4, 3*3=9,4*4=16,5*5=25,6*6=36,7*7=49,8*8=64,9*9=81.
The second level of two-digit numbers (e.g., numbers 16, 79, 54) is defined in the same way: by multiplying the numbers themselves. Example 2. 20*20=400; 25*25=625; 40*40=1600. There is a special table of squares of two-digit numbers are placed in the algebra textbook for the seventh grade. It is easy to find the square of any number. To do this, divide the number erected in the square for tens and units. Find the intersection of the row-dozen and column units according to the specified table - cell on the intersection will contain the square of this number.
If no table, square the number , you can find the product number into itself, made in a column. This method is the square of a numberconsisting of any number of digits. However, the square of a large number is better to calculate using a calculator. To do this, multiply on it the specified number with itself. First, dial the desired number using the numeric keypad, then press "*". After that again dial the same number and finally the button "=". The calculator will present on screen the exact answer of a square number.