Two of the most common paper measures are quire (25 sheets) and ream (500 sheets, or 20 quires).
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105mm × 148mm
The measurements of a size A4 paper are 11.7 x 8.3 inches or 297 x 210 millimeters. It is just a little bigger than the standard letter size of paper.
210 mm x 99 mm
148 × 210 mm 5.83 x 8.27 in (rounded up)
5.8 x 8.3 inches or 148 x 210 mm