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Together Roamer and Number Lines provide students with models of arithmetic. For example, older pupils might learn a rote rule like, “Two minuses are a plus”. If they use Roamer to explore a Number Line they focus on key mathematical ideas: what is a negative number; what is a positive number; what does subtraction look like. Instead of learning a rote rule they gain a visual, spatial and kinaesthetic understanding.
On one side Number Line has 11 squares numbered 0 to 10. The other side has numbers 0 to -10. If you put two together you get a -10 to 10 line. The Line provides Roamer with a durable nonslip running surface. Forward 1 moves Roamer to the next square.