Hello there! :)
Answer:
20 crates
Explanation:
Since he has 230 boxes and each crate can have up to 12 boxes, we can divide 230 by 12 to see how many crates will be needed:

Let's do long division to solve this:
we have the equation 230 ÷ 12
__________
12 | 2 3 0
__0_______
12 | 2 3 0
-0
2 3
__0__1____
12 | 2 3 0
-0
2 3
-1 2
1 1 0
__0__1__9_
12 | 2 3 0
-0
2 3
-1 2
1 1 0
-1 0 8
0 0 2
So, as we can see, the quotient is 19 but we have a remainder of 2, which means that, from the 230 boxes, 228 fits into 19 crates and 2 boxes are left. This means that we will need one extra crate to put these 2 boxes.
So, in total, he will need 20 crates.

If you have any queries please ask.