Ko te mati whai tikanga, koia nei te nui o ngā mati e tika ana hei whakaatu i te uara o tētahi tau mēnā e whakaawhiwhia ana taua tau. Hei tauira, ko te tāroaroa o tētahi tangata - kia 3 ngā mati whai tikanga, arā pea ko te 1.76m. Kāore he take o te 1.76459m (kāore hoki e taea kia pērā rawa te tōtika o te ine). Ki te whakaawhiwhia te 0.0287 kia rua ngā mati whai tikanga, ko te 0.03 tērā. Ki te whakaawhiwhia te 3,745 kia rua ngā mati whai tikanga, ko te 3,700 tērā (TRP 2010:169). / A significant figure is the number of digits necessary to show the value of a number when rounding off, or making an approximation. For example, giving the height of a person to three significant figures would be 1.76m. The exactness of a measure such as 1.76459m would be unnecessary, and difficult to measure correctly. Rounding 0.0287 to two significant figures would be 0.03. Rounding 3,745 to two significant figures would be 3,700 (TRP 2010:169).

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