Blank 10 × 10 grids for decimals and percents, 1 to 6 to a page.
A hundred grid makes one whole out of 100 small squares, so each square is 0.01 or 1%. Shading squares models decimals, percents and fractions with denominators of 10 and 100.
The heavier middle lines split the grid into quarters, which helps when shading 25%, 50% and 75%.