Thanks for your replies.
I too came up with 10 - after drawing a diagram.
The teacher has told them to divide 10000 sq cm by 875 sq cm (10000 sq cm = 1 sq m; 35cm x 25cm = 875 sq cm) giving an answer of 11.
Love to know how she intends to make the 11th pane of glass from the leftover bits!
I am annoyed because I get also 11 and not 10 like you
I do it through a mathematical way, without drawing...
The area of the sheet of glass is: 100x 100 = 10 000 sq cm
The area of one pane of glass is: 35cm x 25cm = 875 sq cm
So I divided the area of the big sheet of glass by the area of one pane (long division, sorry, I can't find the horizontal line above the dividend and for the subtraction. How can I do that?):
875 | 10000
so that makes 11 panes of glass and there is a reminder...
Is it really important to work with a diagram and find 10? I am at a loss now?