8/11/2019 6th Standard Mathematics 1st Term

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6thstandard mathematics 1stterm

1.

In ascending orderof numbers there is no end.

2.

Natural numbersare called counting numbers or positive integers.wedenote it as N = {1,2,3,}

3. Whole numbersare called as non-negative numbers. We denote it as W

= {0,1,2,3,}4.

There is a successorfor every whole number

5.

There is a predecessorfor every whole number exceptzero.

6. All the numbers which divide a given number leaving 0 as remainder are

called as divisorsof the given number.

7. Prime numbersare numbers which are divided by 1 and itself.

8.

Numbers having more than two divisors are called composite numbers.9.

1 has only one divisor, so1 is neither aprime nor composite number.

10.Divisibility test of numbers:

2: number ending with 0, 2, 4, 6, 8

5: Number ending with 0,5

10: numbers ending with 04: Last two digits divisible by 4

8: last three digits divisible by 8

3: sum of the digits should be divisible by 3

9: sum of the digits divisible by 9]

6: number that is divisible by 2 & 3

11: If the difference between the sum of the digits is the odd places andsum of the digits in the even places is neither 0 or multiples of 11

11.The smallest among the common multiples of two numbers is called their

l.c.m

12.g.c.d of any two consecutive numbers is1and they are said to be

relatively prime numbers.13.

The method of expressing a number as a product of prime numbers is

called prime factorization14.Among the common divisors of the given numbers, the greatest divisor is

theg.c.d

15.

The product of any two numbers is equal to the product of their g.c.d and

l.c.m

16.Like fractionshavingsame denominator.

17.

For addition and subtraction of fractional numbers with denominator, all

the numerators are added and the sum is written as numerator in the result

,keeping the denominator same

18.

The value of decimal point is alwaysless than 1in the decimal numberzero to the extreme right end has no value

8/11/2019 6th Standard Mathematics 1st Term

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19.Point indicates a definite position

20.

A ray is starts from a fixed point and extends indefinitely in the other

direction.

21.

A line segmenthas definite length and has both starting point and

ending point.22.A planeis a flat surface which extends indefinitely in all direction.23.

To form a plane it is enough to have three pointswhich do not lie in the

same line.

24.

Lines whichdo not intersecteach other are called parallel lines

25.Three or more lines passing through a point are called concurrent lines

26.The point through which the lines pass is called point of concurrency27.

Two lines which intersect each other at right angle are called

perpendicular lines28.

Three or more points which lie on the same planes are called collinear

points