Practising subtraction

Practising subtraction for 6-7 years old pupils. Answers should be provided for subtraction exercises generated randomly from a multiplication table. In order to have motivation for correct answers, a fox chases a rabbit and catches it after certain number of wrong answers. A confusion table shows correct and wrong answers to reveal problematic subtractions.
Choose possible 'subtrahend(s)' from 1 to 10, then press button Start. 'Minuend' will be generated automatically. Provide the correct answer, the 'difference' of the subtraction into the input box and press key Enter.