Is 51 divisible by 3

Step by step

The question

Question: is 51 divisible by 3?

Divisible means it goes in exactly, with nothing left over.

1 Add the digits

We add the digits: 5 + 1 is 6.

Why add the digits?

Each ten is 9 and 1 more.

Each hundred is 99 and 1 more.

3 and 9 go into the 9s and 99s.

What is left over is the sum of the digits.

For 3: 6 divided by 3 is 2, nothing left over.

So 3 goes into 51.

Careful!

For 3, the last digit does not tell us.

51 ends in 1, and 3 still goes in.

We add the digits.

2 Write the answer

So 51 is divisible by 3.

3 Check

Let's check by dividing.

51 divided by 3 is 17, nothing left over.

The tests were right!

Let's look back.

First: add the digits.

Then: write the answer.

Last: check.