3. Using divisibility tests, determine which of following numbers are divisible by 6:
(a) 297144        (b) 1258             (c) 4335       (d) 61233        (e) 901352   
(f) 438750         (g) 1790184       (h) 12583     (i) 639210        (j) 17852

Answers (2)

(a) 297144 

Since the last digit Of the number is 4, it is divisible by 2. On adding all the digits of the number, the sum obtained is 27. Since 27 is divisible by 3, the given number is also divisible by 3. As the number is divisible by both 2 and 3, it is divisible by 6.

(b) 1258

Since the last digit of the number is 8, it is divisible by 2. On adding all the digits of the number, the sum obtained is 16. Since 16 is not divisible by 3, the given number is also not divisible by 3. As the number is not divisible by both 2 and 3, it is not divisible by 6.

(c) 4335

The last digit of the number is 5, which is not divisible by 2. Therefore, the given number is also not divisible by 2. On adding all the digits of the number, the sum obtained is 15. Since 15 is divisible by 3, the given number is also divisible by 3. As the number is not divisible by both 2 and 3, it is not divisible by 6.

(d) 61233

The last digit of the number is 3, which is not divisible by 2. Therefore, the given number is also not divisible by 2. On adding all the digits Of the number, the sum obtained is 15. Since 15 is divisible by 3, the given number is also divisible by 3. As the number is not divisible by both 2 and 3, it is not divisible by 6.

(e) 901352

Since the last digit of the number is 2, it is divisible by 2. On adding all the digits of the number, the sum obtained is 20. Since 20 is not divisible by 3, the given number is also not divisible by 3. As the number is not divisible by both 2 and 3, it is not divisible by 6.

(f) 438750

Since the last digit of the number is O, it is divisible by 2. On adding all the digits of the number, the sum obtained is 27. Since 27 is divisible by 3, the given number is also divisible by 3. As the number is divisible by both 2 and 3, it is divisible by 6.

(g) 1790184

Since the last digit of the number is 4, it is divisible by 2. On adding all the digits of the number, the sum obtained is 30. Since 30 is divisible by 3, the given number is also divisible by 3. As the number is divisible by both 2 and 3, it is divisible by 6.

(h) 12583

Since the last digit of the number is 3, it is not divisible by 2. On adding all the digits of the number, the sum obtained is 19. Since 19 is not divisible by 3, the given number is also not divisible by 3. As the number is not divisible by both 2 and 3, it is not divisible by 6.

(i) 639210

Since the last digit of the number is O, it is divisible by 2. On adding all the digits of the number, the sum Obtained is 21. Since 21 is divisible by 3, the given number is also divisible by 3. As the number is divisible by both 2 and 3, it is divisible by 6.

(j) 17852

Since the last digit of the number is 2, it is divisible by 2. On adding all the digits of the number, the sum obtained is 23. Since 23 is not divisible by 3, the given number is also not divisible by 3. As the number is not divisible by both 2 and 3, it is not divisible by 6.

i) 297144

 

divisible by 2: since the number has a digit 4 at its one's place it is divisible by 2.

 

divisible by 3: if we add 2+9+1+4+4 we get 27 which is a multiple of 3. so, it is divisible by 3.

 

since the number is divisible by both 2 and 3 it is divisible by 6.

 

ii) 1258

 

divisible by 2: since the number has a digit 8 at its one's place it is divisible by 2.

 

divisible by 3: if we add 1+2+5+8 we get 16 which is not a multiple of 3. so, it is not divisible by 3.

 

since the number is not divisible by both 2 and 3 it is not divisible by 6.

 

iii) 4335

 

divisible by 2: since the number has a digit 5 at its one's place it is not divisible by 2.

 

divisible by 3: if we add 4+3+3+5 we get 15 which is a multiple of 3. so, it is divisible by 3.

 

since the number is not divisible by both 2 and 3 it is not divisible by 6.

 

iv) 61233

 

divisible by 2: since the number has a digit 3 at its one's place it is not divisible by 2.

 

divisible by 3: if we add 6+1+2+3+3 we get 15 which is a multiple of 3. so, it is divisible by 3.

 

since the number is not divisible by both 2 and 3 it is not divisible by 6.

 

v) 901352

 

divisible by 2: since the number has a digit 2 at its one's place it is divisible by 2.

 

divisible by 3: if we add 9+0+1+3+5+2 we get 20 which is not a multiple of 3. so, it is not divisible by 3.

 

since the number is not divisible by both 2 and 3 it is not divisible by 6.

 

vi) 438750

 

divisible by 2: since the number has a digit 0 at its one's place it is divisible by 2.

 

divisible by 3: if we add 4+3+8+7+5+0 we get 27 which is a multiple of 3. so, it is divisible by 3.

 

since the number is divisible by both 2 and 3 it is divisible by 6.

 

vii) 1790184

 

divisible by 2: since the number has a digit 4 at its one's place it is divisible by 2.

 

divisible by 3: if we add 1+7+9+0+1+8+4 we get 30 which is a multiple of 3. so, it is divisible by 3.

 

since the number is divisible by both 2 and 3 it is divisible by 6.

 

viii) 12583

 

divisible by 2: since the number has a digit 3 at its one's place it is not divisible by 2.

 

divisible by 3: if we add 1+2+5+8+3 we get 19 which is not a multiple of 3. so, it is not divisible by 3.

 

since the number is not divisible by both 2 and 3 it is not divisible by 6.

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