One Atta Time Flash Cards Distance Learning Create New Sheet Select a Worksheet > Version 1 Version 2 Version 3 Version 4 Version 5 Version 6 Version 7 Version 8 Version 9 Version 10 Grab 'em All Subtracting Minutes Subtract minutes when the numbers go up and down by 15 minutes at a time.Count back by quarters of an hour to find how much time is left.Work quickly and accurately with minute subtraction facts based on 15, 30, and 45.Use skip-counting by 15s to double-check minute subtraction.