Finding the square of a number is easy. If you meet a number or easy numbers like 20 or 25 look for the squares will be very easy (ie 400 and 625). Then then if we meet with the number squared operation with the more difficult numbers, how to calculate it quickly without using the calculator? Let's see some quick tricks to find the square of a number following.
a. Squares of Numbers ending in numbers 1
Quick tricks:
First, squared the numbers in front of unit 1
Second, multiply the two numbers in front of unit 1 then combine the unit of multiplication with the unit of the first multiplication. If the result is more than nine add dozens to the left.
Add a non-unit number from the second step to the first number then merge. After that add the number 1 behind it.
Let's not complicated and more understand let us refer to the following example. What is the square of the number 251?
First we squared the numbers other than the units of 25 -> 625
Second we multiply the number 25 with the number 2 -> 50
From the number 50 is 5 we add to 625 and 0 we paste behind it and paste the number 1 behind him
-> 625 + 5 = 630
-> 630 put 0 -> 6300
-> 6300 paste 1 -> 63001
Another example, look for kudarat from number 771
Kuadarat number 77 is 5929
Twice 77 is 151
154 -> number 15 we add to 5929 and number 4 we paste dibelakannya.
-> 5929 + 15 = 5944
-> 5944 we paste 4 = 59444
-> 59444 we paste 1 = 594441 (to check the truth please try using a calculator.
b. Squares of two-digit numbers ending in number 5
When you want to find the value of the squares of two digit numbers that end with the number 5 try this one trick. Remember this trick applies only to two-digit numbers.
Quick Tricks
Add the number 1 on the number of tens then multiply by sayna tens.
Paste the number 25 in the back. Buddy will meet the result
Example 652 or 65 x 65
add the number one on the number of tens -> 6 + 1 = 7
multiply by the number of tens is 7 x 6 = 42
paste the number 25 meet 4225
Example 85 x 85
8 + 1 = 9
9 x 8 = 72
72 outboard with 25 meet 7225 so the square of the number 85 is 7225
c. Kudrat number ends in 5 with the number of digits up
If in the previous letter b trick only for two-digit numbers ending in number 5, this time we will try tricks to find the squares for any number of digits but ending in number 5.
Quick Tricks
Add the number 1 on the number to the left of the number 5
Multiply by the number to the left of number 5
Paste the number 25 in the back
Example 2352
add the numbers 1 to 23 meet 24
multiply 24 by 23 meet 552
pasted the number 25 he found 55225, so the square of the number 235 is 55225
Another example 1552
add number 1 to number 15 meet 16
multiply 16 by 15 meet 240
paste the number 25 dibelakannya meet 24025