8 steps

Step 1: Make 10 rows with 3 coins in each row, using only 9 coins.

Step 2: Solution. Let’s take a closer look.

Step 3: ‘X’s represent the coins.

Step 4: We’ve marked the first three rows in pink.

Step 5: Fourth row in blue.

Step 6: Fifth and sixth rows in green.

Step 7: Seventh and eighth in purple.

Step 8: And the last two rows in red. Ten rows of 3 coins turns out to be possible using only 9 coins!

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