Beadstick ITP Partition, and calculate with numbers, using beadsticks. Set up a number and then add or subtract Watch as beads are added or removed Shift 10s as required Model addition and subtraction calculations
Drag N Drop Math Drag and Drop Math is an interactive program that reinforces dozens of standards in addition, subtraction, multiplication and division. It allows users to pinpoint exactly what kind of math problems they need to work on and Read More …
Step by step vertical subtraction – expanded method Y3/4
Difficult concept to do in flash – not sure if it is better than teacher’s own! Worth a look, though.