Rounding numbers

When a number is given and the number is rounded (or rounded off), then we approximate a value by eliminating the least significant digits or we can say that you are finding the closest number which is multiple of ten.
Example: - Let there are two number 52 and 385. Round off the given numbers?
Solution: - The number 52 can be rounded down into 50. (This number can be rounded to tens place),
and the number 385 can be rounded up to 400. This number can be rounded to the hundred places.
In case of whole number, whole number can be rounded to the tens place, hundreds place, thousand place and continue so on. If a number is rounded to the tens place than the final form has a zero number for the ones digit and if the number is rounded to the hundreds place than the last two values tens and ones digit is zero.
We have to apply the same procedure for the decimal number. Decimal number (also read how to divide decimals) can also be rounded; this is approximately the number which is nearest to the tenth, hundred and thousand or other given decimal place and if the decimal number is rounded to the tenth place, then the final number has no digit in the hundredths place and when a decimal number is rounded to the hundredths place then the final number has no digit in the thousandths place. Rounding makes the number very easy. Rounded numbers are only approximate number. Rounding number never give exact answer. Rounding the number gives the closest answer but it does not have exact answer.
Now we will see process of Rounding numbers:
Example: - Let there are two number 99 and 21. Change the number into rounding number?
Solution: - The number 99 can be rounded up in to 100. (This number can be rounded to hundred Place),
 The number 21 can be rounded down into 20. (This number can be rounded to tens place),

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Multiplication problems

This unit is designed for Grade IV and here in help in math session we are going to learn about Multiplication problems. We know that multiplication word means to add repeatedly and to increase in the fixed quantity. Here we are dealing with the problems of multiplication, we need to first learn that what all are the problems of multiplication, how to do double digit multiplication and  how to recognize such problems.
Some times we come across real life problems, in which we are given the cost of one article and we need to find the cost of more than one article. For instance if we say that the cost of 1 cod drink is $2, now if a child wants to buy 2 cold drinks, he needs $2 + $ 2 =$4 . Further if he requires three cold drinks, he will spend  $2 + $ 2 + $2 = $ 6. Thus what we observe is that every time the number of cold drinks is increasing , we are adding $2 to the previous total, or we can say that the cost of unit article is added the number of times the object is required. It can also be done more easily if there are n number of objects and the cost of 1 article is multiplied by n. for more on this subject visit this
This is easier and simple method of getting the solution for problems of multiplication.
Example: If 1 sack of rice cost 25$, then find the cost of 5 sacks of cement.
Sol: We know that the cost of 1 sack of cement = $ 25
So, to find the cost of 5 sacks of cement, we need to  multiply the cost of the unit  sack by the number of the sacks required.
So we get = $25 * 5 = 125 $
In this way all such real life problems can be solved using multiplication.

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