To determine how many pieces of size 304mm by 304mm (millimeters) can be cut from a 10 by 4 foot sheet of plywood, let's first convert the dimensions of the plywood from feet to millimeters.
1 foot = 304.8 millimeters

So, a 10 by 4 foot sheet of plywood is equivalent to:

10 feet * 304.8 millimeters/foot = 3048 millimeters (length)
4 feet * 304.8 millimeters/foot = 1219.2 millimeters (width)

Now, let's see how many pieces of size 329 by 329 millimeters can fit into this sheet.

For the length:
3048 millimeters / 304 millimeters per piece ≈ 10 pieces

For the width:
1219.2 millimeters / 304 millimeters per piece ≈ 4 pieces

So, you can cut a total of 10 × 4 = 40
10 × 4 = 40 pieces of size 304 by 304 millimeters from a 10 by 4 foot sheet of plywood.