What numbers are missing from the empty grid? Clue: Look at matching segments-the middle circle is the link!

2 . . . . . 4----------7 . . . ..1------------2. . . . . 3
3. . . . . .1----------2. . . . .5------------4. . . . . 4
. . . . . . . .9 . . . .5-----------?. . . . . 4
. . . . . . . .5 . . . .6-----------6. . . . . .?

Hi bbush,

The ? is a 9 in both cases.

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Why?

Because, per row, take one element, and the next but one to the right, and add them together.
Move two rows down, and put this in the slot between them.

Examples:

Row 1, Element 1: 2
Row 1, Element 3: 7
So, Row 3, Element 2 = 2 + 7 = 9.

For the leftmost ?:
Row 1, Element 3: 7
Row 1, Element 5: 2
So, Row 3, Element 4: 7 + 2 = 9.

For the rightmost ?:
Row 2, Element 4: 5
Row 2, Element 6: 4
So, Row 4, Element 5: 5 + 4 = 9.

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You could even add a fifth and sixth row, by the same rules:

2 . . . . . 4----------7 . . . .. .1------------2. . . . . 3
3. . . . . .1----------2. . . . . .5------------4. . . . . 4
. . . . . . .9 . . . . .5-----------9. . . . . . 4
. . . . . . .5 . . . . .6-----------6. . . . . . 9
. . . . . . . . . . . . 18 . . . . 9
. . . . . . . . . . . . 11 . . . . 15