This is the second exercise in the KotU album for common multiples. Kal-El is laying out the multiples of two, three, and four horizontally with their products vertically below them.
It is really easy for the child to see which products each series has in common. There is a nice script in the album for explaining what a common multiple is.
Next, the child identifies the common multiples. We used the number tiles for the common multiple. Each equation and its product are set out in a row and enclosed in parentheses.
I snapped this photo when he was nearly finished. I think he still had the number 18 to find.
Next week we'll work on finding the common multiples of two-digit numbers (such as 12 and 16).