15. each ? below represents a factor between 1 and 9. draw lines to match

each fact on the left with a pattern for its products on the right.

? xo

o in the ones place

? x1

o or 5 in the ones place

? x 2

0,2,4,6, or 8 in the ones place

? x 5

the other factor in the ones place

? x9

1 less than the unknown factor in the tens place