Question

Write the divisibility test of the folloing numbers
(A) 3
(B) 4
(C)8
(D)10

Answer 1

Step-by-step explanation:

• number is divisible by 3, if the sum of its all digits is a multiple of 3 or divisibility by 3. Sum of all the digits of 54 = 5 + 4 = 9, which is divisible by 3. Hence, 54 is divisible by 3. Sum of all the digits of 73 = 7 + 3 = 10, which is not divisible by 3.
• 4: last two digits are 72 and 72 is divisible by 4. Therefore, 572 is also divisible by 4. by 8: last three digits are 572 and 572 is not divisible by 8. by 4: last two digits are 52 and 52 is divisible by 4
• by 8: last three digits are 352 and 352 is divisible by 8. Therefore, 726352 is also divisible by 8.
• number is divisible by 10 if the last digit is 0
• So, 54450,10800,7016930,10101010 are divisible by 10 and 7138965 is not divisible by 10.

Answer 2

Answer:

•To know whether a given number is divisible by 3 just add the sum of digits in given no. if the result is a multiple of 3 so the no. is divisible by 3

ex- 81 (8+1)=9

9 is a multiple of 3 so it is divisible by 3

•To know whether a given number is divisible by 4 see the last digit of number if it is 4,0 or any divisible of 4

•To know whether a given number is divisible by 8 see the last digit of number if it is 8,0 or any divisible of 8

• To know whether a given number is divisible by 10 the last digit must have 0

ex 110 the last digit is zero so it is divisible by 10