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Yogita Ingle 5 years, 6 months ago
A prime number is a positive integer having exactly two factors. If p is a prime, then it’s only factors are necessarily 1 and p itself. Any number which does not follow this is termed as composite numbers which means that they can be factored into other positive integers.
First Ten Prime Numbers
The first ten primes are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.
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Meghna Thapar 5 years, 6 months ago
The rule of alligation states "When different quantities of different ingredients are mixed together to produce a mixture of a mean value, the ratio of their quantities is inversely proportional to the differences in their cost from the mean value." Alligation is a rapid arithmetic method used to solve problems that involve mixing two products of different strengths to form a product having a desired intermediate strength. ... Alligation medial is used in calculating the strength of the mixture of two or more components of different strengths. Mixture: Mixing of two or more than two type of quantities gives us a mixure. Quantities of these elements can be expressed as percentage or ratio. Alligation: Alligation is a rule which is used to solve the problems related to mixture and its ingredient.a
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Meghna Thapar 5 years, 6 months ago
Whole numbers include natural numbers that begin from 1 onwards. Whole numbers include positive integers along with 0. There is no 'largest' whole number. Except 0, every whole number has an immediate predecessor or a number that comes before. So, 1 is the smallest natural number and 0 is the smallest whole number. But there is no largest whole number or natural number because each number has its successor.
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Meghna Thapar 5 years, 6 months ago
A square root of a number is a value that, when multiplied by itself, gives the number. Example: 4 × 4 = 16, so a square root of 16 is 4. Note that (−4) × (−4) = 16 too, so −4 is also a square root of 16. The symbol is √ which always means the positive square root. Therefore, it is a root of the equation , where is the number to which we have to find power half. So, a number raised to the power half is nothing but the side of the square when the area is the original number - and it is also a root of the above mentioned equation. So you get the idea - square root.
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Meghna Thapar 5 years, 6 months ago
Read the degree marking where the ruler crosses the curved edge of the protractor. You'll notice two sets of degrees along the edge: an inner and outer scale. Both scales go from 0 to 180, but they run in opposite directions. If the angle opens to the right side of the protractor, use the inner scale.
an obtuse angle; 127° |
a right angle; 90° |
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How to measure an angle with a <i>protractor</i>:
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Yogita Ingle 5 years, 6 months ago
The pencil cost was 2 Rs.
So, the cost of 120 pencils = 2 × 120 = 240 Rs
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Yogita Ingle 5 years, 6 months ago
Closure Property
They can be closed under addition and multiplication, i.e., if x and y are two whole numbers then x. y or x+y is also a whole number.
Commutative Property of Addition and Multiplication
The sum and product of two whole numbers will be the same whatever the order they are added or multiplied in, i.e., if x and y are two whole numbers x+y=y+x and x.y=y.x
Additive identity
When a whole number is added to 0, its value remains unchanged, i.e., if x is a whole number then x+0=0+x=x
Multiplicative identity
When a whole number is multiplied by 1, its value remains unchanged, i.e., if x is a whole number then x.1 = x = 1.x
Associative Property
When whole numbers are being added or multiplied as a set, they can be grouped in any order, and the result will be the same, i.e. if x, y and z are whole numbers then x+(y+z)=(x+y)+z and x.(y.z)=(x.y).z
Distributive Property
If x,y and z are three whole numbers, the distributive property of multiplication over addition is x. (y+z)=(x.y)+(x.z), similarly, the distributive property of multiplication over subtraction is x. (y-z)=(x.y)-(x.z)
Multiplication by zero
When a whole number is multiplied to 0, the result is always 0, i.e., x.0=0.x=0
Division by zero
Division of a whole number by o is not defined, i.e., if x is a whole number then x/0 is not defined.
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