Tīpoka ki ngā ihirangi matua
Whakaoti mō x
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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

x+15+3=900
Whakawehea te 30 ki te 10, kia riro ko 3.
x+18=900
Tāpirihia te 15 ki te 3, ka 18.
x=900-18
Tangohia te 18 mai i ngā taha e rua.
x=882
Tangohia te 18 i te 900, ka 882.