To calculate how many pieces of size 329mm by 329mm (millimeters) can be cut from a 10 by 4 feet sheet of plywood, we first need to 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 / 329 millimeters per piece ≈ 9.27 pieces

For the width:
1219.2 millimeters / 329 millimeters per piece ≈ 3.70 pieces

Since you can't have a fraction of a piece, you need to round down to the nearest whole number because you can't fit a partial piece:

Along the length: 9 pieces Along the width: 3 pieces

So, you can cut a total of 9 × 3 = 27
9 × 3 = 27 pieces of size 329 by 329 millimeters from a 10 by 4 foot sheet of plywood.