How to find square of a 4 digit number quickly,no caller id on home phone jobs,how can i find out who a mobile phone number belongs to - New On 2016

To know the answer to this question, you will have to pay homage to the simplest of all rules- the digit-sum rule.
Digit-Sum Rule of Multiplication: The digit-sum of the product of two numbers is equal to the digit sum of the product of the digit sums of the two numbers! Suppose a student is trying to find the product 316 ? 234 ? 356, and he obtains the number 26525064. Example: The digits of the number (4)24 are summed up continually till a single digit number is obtained.
It can be seen from the table that the digit-sum of the numbers which are perfect squares will always be 1, 4, 9, or 7.
Note: A number will NOT be a perfect square if its digit-sum is NOT 1, 4, 7, or 9, but it may or may not be a perfect square if its digit-sum is 1, 4, 7, or 9.
Already said by the ghost that its not necessary that the numbers with sum digit = 1, 4, 7 or 9 are perfect squares.
After applying an arithmetic operation to two operands and getting a result, you can use this procedure to improve your confidence that the result is correct. Sum the digits of the first operand; any 9s (or sets of digits that add to 9) can be counted as 0. If the resulting sum has two or more digits, sum those digits as in step one; repeat this step until the resulting sum has only one digit. Apply the originally specified operation to the two condensed operands, and then apply the summing-of-digits procedure to the result of the operation.

If the result of step 4 does not equal the result of step 5, then the original answer is wrong.
Percentage Trick - Solve precentages mentally - percentages made easy with the cool math trick! This chapter covers how to determine and report positions on the ground in terms of their locations on a map. In a city, it is quite simple to find a location; the streets are named and the buildings have numbers.
One of the oldest systematic methods of location is based upon the geographic coordinate system. The latitude 32° 19'06" could be either north or south of the equator, so the letter N or S must be added to the latitude. An examination of the transverse Mercator projection, which is used for large-scale military maps, shows that most lines of latitude and longitude are curved lines. EXAMPLE: The first grid line north of the south-west corner of the Columbus map is labeled 3570000m N.
Based on the military principle for reading maps (RIGHT and UP), locations on the map can be determined by grid coordinates. Care should be exercised by the map reader using the coordinate scale when the desired point is located within the zero-zero point and the number 1 on the scale. There is only one rule to remember when reading or reporting grid coordinates— always read to the RIGHT and then UP.

A disadvantage of any standard system of location is that the enemy, if he intercepts one of our messages using the system, can interpret the message and find our location. All the digits of N2 are added to obtain a number N3, and so on, till we obtain a single digit number N.
Therefore, if base is b the divide 8888^8888 by (b-1) to get the digit sum; the remainder thus obtained is the value of X. Feels like even after putting so much effort in calculating the digit sum, I'm still not sure if my multiplication is correct or not. You now have two one-digit numbers, one condensed from the first operand and the other condensed from the second operand. If the two results match, then the original answer may be right, though it isn't guaranteed to be. The world is divided into 60 grid zones, which are large, regularly shaped geographic areas, each of which is given a unique identification called the grid zone designation.
The precision of a point's location is shown by the number of digits in the coordinates; the more digits, the more precise the location (Figure 4-22, insert).

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