Students can certainly benefit from practicing new skills and concepts on paper. From letters and numbers to report summary formats, worksheets can provide students with a framework for practice _ an avenue for synthesizing new information in their brains. Well designed worksheets can also give students a platform for expressing creative ideas and reaching towards higher levels of thinking.
Be careful when using groups because if you forget that your spreadsheets are grouped and then proceed to add or change figures on a worksheet, all of the worksheets in the group will have the same figures. To remove a group, simply click on a sheet that is not in a group. If all of the worksheets are grouped, right_click on any tab and choose Ungroup Sheets. Keep an eye on the title bar prior to making changes and Excel will tell you if the sheets are grouped.