Question

Which of the following number is divisible by 8?​

Answer 1

b.

Explanation:

A number is divisible by 4 if the last 2 digits are also divisible by 4 and it might also be divisible by 8.

2184 is the only number in the list whose last 2 digits are divisible by 4.

So we check the number 2184.

2184 / 8

= 273.

Answer 2

Answer: 2184 is divisible by 8.

Explanation:

A number is divisible by 8 if the last 3 digits are divisible by 8.

1210 => 210

We can check this pretty quickly by adding together numbers divisible by 8 to try and get 210.

First, let's add 80 (8*10) and 80.

80 + 80 = 160

Now let's add 40 (8*5).

160 + 40 = 200

As we can see, 210 is not divisible by 8, as 208 is (both can't be).

2184 => 184

80 + 80 = 160

Now, let's add 16 (8*2) first.

160 + 16 = 176

176 is divisible by 8. We can see that if we just add 8 (8*1), we get 184.

176 + 8 = 184

Thus, 184 is divisible by 8.

5134 => 134

80 + 40 = 120

120 + 16 = 136

134 can't be divisible by 8, as 136 is.

7122 => 122

80 + 40 = 120

122 can't be divisible by 8, as 120 is.

Answer: 2184 is divisible by 8.