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Introduction to numbers and Integers
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Jun 10, 2025
This video tutorial is about introduction to numbers and Integers for class 7
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hello and welcome to this video tutorial
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which is about
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integers we use numbers to count
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anything so what are various type of
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numbers so first one is natural numbers
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natural numbers are counting numbers but
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these set of numbers do not include zero
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this is because you cannot count zero so
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numbers 1 2 3 4 5 6 Etc are all natural
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numbers now second type of numbers are
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whole numbers so all natural numbers
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along with zero are called whole numbers
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for example 0 1 2 3 4 5 6 Etc are all
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whole numbers here note that these type
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of numbers do not include fractions from
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the definition of natural numbers we can
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conclude that every natural or counting
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number is a whole
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number number line for whole numbers
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would be like this here we start from
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zero and then move to number 1 2 3 4 5 6
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and and so
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on third type of numbers are
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integers integers include all natural
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numbers 0o and negative numbers for
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example -4 -3
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-2 - 1 0 1 2 3 4 Etc are all integers so
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now we have positive numbers which are 1
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2 and 3 and so on negative numbers which
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are min-1 - 2 - 3 and so on and zero
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which is an integer that is neither
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negative nor
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positive here you should note that
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integers like whole numbers do not
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include fractions for example 3.5 1X 2
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1X 3 and so on number line for integers
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is like now from this number line you
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can see that numbers to the left of zero
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are all negative again from this number
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line you can observe that numbers to the
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right of the zero are all
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positive here this sign means negative
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sign and this sign means positive
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sign one important thing to note here is
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that if the number has no sign attached
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to it as a prefix then it means that it
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is a positive number for example number
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three is really + three which is
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positive on a number line when we add a
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positive integer we move to the right
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and when we add a negative integer we
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move to the left
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left again on the number line when we
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subtract a positive number we move to
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the left and when we subtract a negative
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integer we move to the
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right so students this is it for now and
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for more notes in study material you can
2:45
visit our website physics catalyst.com
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