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Grey Olltwit's Maths Worksheet - Subtraction is a simple application which can help to develop your kids' math skills.
Choose from 3 levels of subtraction sums from single digits to three figure problems. Each sum is randomly produced one at a time on a blackboard style interface. Audio and visual encouragement let's you know when you are right and when you need to try again. Includes the ability to demonstrate "borrow 1". There is a facility to print out personalised certificates to encourage improvement.