We find it easiest to place the cutting board or tray angled up against the side of the cake so the cake lays against it when cutting. Lie the full slice down flat onto the cutting board.
Again using the width of the knife as a guide, cut across the slice of cake into portions

Using the width of the knife to determine how wide to make the cut. Lie the knife down flat on the top of the cake, with the blunt edge of the knife on the edge of the cake. Turn the knife upright and that is where to make the cut.

From the curved edge make a straight cut across the cake from one side to the other.

Repeat this action across the full slice, cutting the same distance each time to get equal portions.
Repeat this action across each full cake slice, until the whole cake has been portioned.

Work with one full slice at a time. This example is a larger slice from the middle of the cake.
The number of complete cuts you make will depend on the size of the cake.

And there you have it, it’s a piece of cake! (pun intended!) How big you cut the pieces is up to you.                                                                                Remember your cutting a cake not a pizza.