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Adding/ subtracting

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Adding and Subtracting Rational Numbers Quiz

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Adding and Subtracting Rational Numbers Quiz

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CBSE 8, Math, CBSE-Rational Numbers, MCQ

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MCQ , Class 8, Math, CBSE-Rational Numbers

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Are you in grade 8 and struggling with the rational numbers concept? Well, worry no more as the quiz below is set to help you out with this. After this, it will be much easier. All the best.

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Multiplication and division of rationalnumbers

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Multiplication and division of rationalnumbers

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Practising Class VII maths: 'Apply multiplication and division rules'

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Fun maths practice! Improve your skills with free problems in 'Apply multiplication and division rules' and thousands of other practice lessons.

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Interactive game

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Rational and Irrational Numbers Video Game. Use your Knowledge of Numbers to Survive!!!

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Storyline of Game: Scientists discovered that there is a direct relationship between irrational numbers and insanity. It turns out that scientists can see irrational and rational numbers inside the human body, on our very cells. The mroe irrational numbers and the more cells infected with irrational numbers that are in a person's body, the more and more insane a person goes.

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Rational Numbers Ex.3.1(Introduction)

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A Rational Number can be made by dividing two integers.
(An integer is a number with no fractional part.)

Example:

1.5 is a rational number because 1.5 = 3/2 (3 and 2 are both integers)

Most numbers we use in everyday life are Rational Numbers.

Here are some more examples:

Oops! The square root of 2 cannot be written as a simple fraction! And there are many more such numbers, and because they are not rational they are called Irrational.

Another famous irrational number is :

Formal Definition of Rational Number

More formally we say:
A rational number is a number that can be in the form p/q
wherep and q are integers and q is not equal to zero.
So, a rational number can be:

Where q is not zero

Examples:

Just remember: q can't be zero

Using Rational Numbers

Fun Facts ....

The ancient greek mathematician Pythagoras believed that all numbers were rational, but one of his students Hippasus proved (using geometry, it is thought) that you could not write the square root of 2 as a fraction, and so it was irrational.

But followers of Pythagoras could not accept the existence of irrational numbers, and it is said that Hippasus was drowned at sea as a punishment from the gods!

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A Rational Number can be made by dividing two integers. (An integer is a number with no fractional part.) 1.5 is a rational number because 1.5 = 3/2 (3 and 2 are both integers) Most numbers we use in everyday life are Rational Numbers. Here are some more examples: Oops!

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Representation of rational number on number line (Ex. 3.1

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(Ex.3.2)Irrational numbers (Ex.3.2)

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Closure / commutativeProperties of addition/ multiplication

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Commutative, Associative and Distributive Laws

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The "Associative Laws" say that it doesn't matter how we group the numbers (i.e. which we calculate first) ...

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Properties of addition/multiplicationAssociative

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Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.