### Mathematics Lab Manual Class 10

Mathematics Lab Manual Class X lab activities for class 10 with complete observation Tables strictly according to the CBSE syllabus also very useful & helpful for the students and teachers.

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All even numbers are divisible by “2”.

Unit digit of this number is “4” it is even. Therefore 258694 is also divisible by “2”

Unit digit of this number is “7”, it is odd. So the number 2586947 is not divisible by “2”.

Divisibility Test by 3:

Example 1:

Let given number is : 3,45,897

Sum of the digits: 3 + 4 + 5 + 8 + 9 + 7 = 36

36 is divisible by “3”, so 345897 is also divisible by “3”

Example 2:

Sum of the digits: 9 + 8 + 5 + 8 + 9 + 7 = 46

As 46 is not divisible by “3”, so 985897 is also not divisible by “3”

Divisibility Test by 4:

Take last two digits of of a given number and divide it by “4”, if it is divisible by “4”, then the given number is also divisible by “4”.

If last two digits of a given number are “0, 0” then that number is also divisible by “4”.

Let given number is 37,984

Last two digits : 8, 4,

Let given number is 8,39,842

Last two digits : 4, 2,

Let given number is 97,39,800

Last two digits : 0, 0 , yes 9739800 is also divisible by “4”

Divisibility Test by 5:

If last digits of a given number is either “0” or “5” then the given number is also divisible by “5”.

Let given numbers are 3,79,520, 7,89,735

Last digit “0” and “5” . Yes above both numbers are divisible by 5

Let given number is 3,79,523

Last digit “3” So above number is not divisible by 5

If a number is divisible by both “2” and “3” then that number is also divisible by 6.

Let given number is 3,57,846

Last digit is “6”, it is even. So it is divisible by “2”

Sum of the digits: 3 + 5 + 7 + 8 + 4 + 6 = 33,

Divisibility Test 7:

Algorithm

**Take last digit of a given number.****Now subtract the double of this digit from the remaining number.****Now see whether the result is divisible by "7" or not.****If judgment is still difficult then repeat the above process again and again, till you left with two digit number then make the judgment.**

Let given number is 21,875

Last digit “5”. Double of 5 is = 10

Now find 2187-10 = 2,177

Last digit “7”. Double of “7” is = 14

Now find 217 - 14 = 203

Last digit “3”. Double of 3 is = 6

Now find 20-6 = 14

Since 14 is divisible by “7” so 21875 is also divisible by “7”

Let given number is 7,89,423

Last digit “3”. Double of 3 is = 6

Now find 78942 – 6 = 78936

Last digit “6”. Double of 6 is = 12

Now find 7893-12 = 7881

Last digit “1”. Double of 1 is = 2

Now find 788-2 = 786

Last digit “6”. Double of 6 is = 12

Now find 78-12 = 76

76 is not divisible by “7” so number 789423 is not divisible by “7”

Divisibility Test by 8:

If number formed by last three digits of a given number is divisible by “8” then the given number is also divisible by “8”.

Let given number is : 57,93,512

Last three digits : 5, 1, 2,

As "512" is divisible by “8” (512/8 = 64) so 5793512 is also divisible by “8”

Let given number is : 5793515

Last three digits : 5, 1, 5,

515 is not divisible by “8”, so 5793515 is also not divisible by “8”

Let given number is : 57,93,000

Last three digits : 0,0,0

So 5793000 is divisible by “8”

Divisibility Test by 9:

If sum of the digits of a given number is divisible by “9” then that number is also divisible by “9”.

Let given number is : 63,918

Sum of the digits: 6 + 3 + 9 + 1 + 8 = 27

27 is divisible by “9”, so this number is also divisible by 9”

Let given number is : 63,925

Sum of the digits: 6 + 3 + 9 + 2 + 5 = 25

25 is not divisible by “9”, so number 63925 is also not divisible by “9”

If last digits of a given number is “0” then the given number is also divisible by “10”.

Let given number is : 63,910

Last digit is “0”, so 63910 is divisible by “10”

Let given number is : 63,917

Last digit is “7” so 63917 is not divisible by “10”

Divisibility Test by 11:

Mark the digits of a given number odd or even, starts from the right side (unit digit).

Add the digits at odd position.

Add the digits at even places.

Find the difference between the two sums.

1.) If difference is either “0” or divisible by “11” then that number is also divisible by 11.

2.) If the difference is not divisible by 11 then that number is not divisible by 11.

Let given number is : 6,59,175

Sum of the digits at even place = 7 + 9 + 6 = 22

Sum of the digits at odd places = 5 + 1 + 5 = 11

Difference: 22-11 = 11

Since difference is divisible by “11” so the number 659175 is also divisible by “11”

Let given number is : 9,59,171

Sum of the digits at even place = 1 + 1 + 5 = 7

Sum of the digits at odd places = 7 + 9 + 9 = 25

Difference: 25-7= 18

Since difference”18” is not divisible by “11” so the number 959171 is not divisible by “11”

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