Math fractions?
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You should notice that…
… is. For example, you can understand that…
So mark one third of the area. For example…
[From the 6 equal columns, I have marked one third of the columns (i.e. 2 out of 6 columns) red.]
Another option as an example…
33 1/3 % are 1/3 and 1/3 of 24 (as many boxes are) are 8 boxes. So you have to “mark” 8 boxes.
These are 24 boxes. You must mark 24*(33+1/3)/100=(792+8)/100=800/100=8 boxes.
Or simpler: 33 1/3% means 1/3, 1/3 of 24 is 8
Or: 33+1/3=(33*3+1)/3=100/3, therefore 24*100/3 /100=24/3=8
Must mark a third
There are a total of 24 boxes, so you need to paint 8 boxes.