These worksheets are printable and can be used for a variety of tasks. Start with adding and subtracting hours, minutes and seconds without regrouping. Then add and subtract minutes and hours again. It can be difficult to figure out how to regroup minutes and seconds, tell the time from slow or fast clocks and find the elapsed times. These pdfs make it easy for learners to take small steps at a time. Get our worksheets for free and you’ll be begging for more!