Use this activity to practise writing numbers to 100. The grid has shaded in squares so students are unable to follow the pattern of a regular 10x10 grid. You may like to enlarge it onto A3 to give students more room to write. Included is a grid with the numbers filled in so students can check their work when finished. Another idea is to give your students a calculator and have tem use the +1 function to check their work with a red pen.