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Remember the booklet in the corner of the box is square, so how many holes could it take up?
The whole box, without the space for the booklet, would fit $100$ discs, so the number of discs must be $100$, less the square number taken up by the booklet.
What do you know about the factors of the total number of discs?
Fractions in a Box
Age 7 to 11
Challenge Level 
Remember the booklet in the corner of the box is square, so how many holes could it take up?
The whole box, without the space for the booklet, would fit $100$ discs, so the number of discs must be $100$, less the square number taken up by the booklet.
What do you know about the factors of the total number of discs?
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