Learning Resources 1-20 Number Line Floor Mat. Get early learners active with this numbered floor mat! Children can develop a variety of early maths skills including number recognition and counting skills as they play on this 3.5m number line! Active play develops gross motor skills and encourages physical development. Features numbers 1-20. Durable and wipe-clean, maths-themed floor mat can be used time and time again. Measures 3.5m L x 30cm W. Suitable for ages 3+.