What is another strategy that you can use to multiply 2 digit by 2 digit numbers?

You may write them separating the units and tens digits, and then use FOIL to add 4 easy tems. For example, let's compute :

dd

step-by-step explanation:

dd

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.