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Showing posts from April, 2014

Understanding GCF or HCF and LCM Class 4 -Mathematics

GCF or HCF = Greatest Common Factor or Highest Common Factor
LCM= Lowest Common Multiple.
GCF : To understand GCF I illustrate an example. Suppose we need to calculate the GCF of two numbers of 16 and 18 , then first we write the factors of each number as tabulated below.
Numbers                     Factors 16 1 2 4 8 16
18 1 2

Unitary Method For Class or Grade 4 - Mathematics

Unitary Method is that in which for further calculation value of unit (1) is required for further calculation.
Unit means one,  mathematically '1'.A, An or Per also mean '1'.
If we know the value of one then to find value of many we do MULTIPLICATION. Read this problem and the table.
Problem 1: Cost of one mango is $ 4. Find the cost of 8 mangoes.-
One Many 1 8 $ 4 ? Solution: 
As the Cost of 1 mango is $ 4. 
Therefor the cost of 8 mangoes is 8x4 = $ 32
Also Watch solution in the video given at the bottom .

If we know the value of many then to find value of one we do DIVISION. Read this problem.
Problem 2: Cost of one mango is $ 4. Find the cost of 8 mangoes.-
Many One 8 1 $ 40 ? Solution: 
As the Cost of 8 mango is $ 40. 
Therefor the cost of 1 mango is 40/8 = $ 5
Also Watch solution in the video given at the bottom .
If we know the value of many then to find value of many we first need to calculate the value of 1. 
Note:  students of lower classes faces more difficulties in this type of…

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Ratio Mathematics ICSE Tutorial Class 7

There are four videos of Ratio class 7. Few sums have also been explained with very easy steps. If there are any doubts then comment below. We will try to clear those doubts.

1. Understanding Ratio:


2. Comparing Ratio Basic and Shortcut method:

3. Compound Ratio , continued Ratio Dividing a number in a given Ratio:

4. Solution of few problem of ratio:
These sums of Ratio class 7 have been discussed in this video:
1. write in simplest form
72:108, 1/6:1/2,
15cm to 4m.
2. Population of a village is 32400. The ratio of literate
to illiterate person in the village is 11:7. Find the actual number of literate person and illiterate person. .
3. If a, b and c are three numbers such that a:b=4:9 and b:c=27:35. Find a:c
4. In what ratio should we increase 650 to obtain 1000.