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

User Mattfred
by
6.3k points

2 Answers

4 votes
The digit is 1. An easy trick is to sum up all the digits and if that is divisible by 3, then the number will be
User Prencher
by
7.3k points
1 vote

Answer:


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

User Adam Gonzales
by
6.6k points
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