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This tablet-friendly mental maths game from Topmarks called Blast Off has different levels of difficulty making it suitable for 5 to 8 year olds. It's designed to help children identify and work with two-digit numbers. The oral questions have multiple choice answers which children will have to listen to carefully.
In the first game mode children have to find a specific number. In the second they are required to find a number in between two given numbers. The Count On and Count Back games are designed to help children learn some of the vocabulary of addition and subtraction. Examples of the oral questions are 'Count back four from twenty-seven', 'Count on five from sixty-one', 'What is seven more than thirty-one?' and 'What is eight less than eighty-seven?'.