The three symbols on each tree create a number together.
Put the symbols on top of each other.
Anything that comes up twice cancels itself out.
Left tree: if you put the six on the eight, everything is cancelled out except for the uppermost vertical line on the right. If you now put the third symbol on top of that, you have a four. Do the same with the other two trees.
Do you have something to write with?
With a pen or pencil, draw lines in the directions indicated by the symbols (not on the puzzle!)
Each row of symbols will give you one number.
With a pen or pencil, draw lines in the directions as indicated. The solution creates a number.
Put the matching rocks together.
Final answer from left to right.
The calculated number is the final answer.
The five-dot piece and four-dot piece fit together. They equal nine. The two pieces with two dots fit together. They equal zero. The three-dot piece, plus piece and three-dot piece fit together. They equal six.