Find the smallest digit which makes the following number divisible by 3: 2438_

Step-by-step explanation:

There's a trick to this question. If you add the digits you have and get an answer (which will be quite small), you can get a quick answer.

2+4 + 3 + 8 = 17

If you add just 1 more, you will get 18 which is divisible by 3. Other numbers will work as well

18/3 = 6 So

24381 is one answer that will work. Try it.

24381 ÷ 3 = 8127

Let's go back and try other numbers. 2438_ adds to 17 If we add 4 unto 17 we get 21. Twenty one is divisible by 3. So

24384 / 3 = 8128

If you try 7, (which you can try yourself), you should get something divisible by 3

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

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answer