divisibility 2,5,10,3 & 9 (1)+ study
Answers
Answer:
- A number is divisible by 2 if the digit at unit place is either 0 or multiple of 2. So a number is divisible by 2 if digit at its units place is 0, 2, 4, 6 or 8.
- A number is divisible by 5 if its last digit is a 0 or 5. Since the last digit is 0, this number is divisible by 5. Since the last digit is 5, this number is divisible by 5.
- A number is divisible by 10 if the last digit of the number is 0. The numbers 20, 40, 50, 170, and 990 are all divisible by 10 because their last digit is zero, 0. On the other hand, 21, 34, 127, and 468 are not divisible by 10 since they don't end with zero.
- Divisible by 3. A number is divisible by 3, if the sum of its all digits is a multiple of 3 or divisibility by 3.
- A number is divisible by 9, if the sum is a multiple of 9 or if the sum of its digits is divisible by 9.
Step-by-step explanation:
• Ex 168 is divisible by 2 since the last digit is 8
• Ex 150 and 155 is divisible by 5 since the last digit is 0 or 5.
• Ex 20 is divisible by 10 since the last digit is 0
•Sum of all the digits of 54 = 5 + 4 = 9, which is divisible by 3. Hence, 54 is divisible by 3.
• The numbers which are divisible by 9, using the test of divisibility by 9: 99, 198, 171, 9990, 3411. Sum of the digits of 99 = 9 + 9 = 18, which is divisible by 9.