Ko te tohu e whakamahia ana hei tohu i te whakarea, te whakarea rānei? I runga i te pātai o mua, tuhia he horopaki kei roto te whakautu. Ka taea te 1 - 20 rerenga kōrero. Te horopaki:
He mea whakamātau ki te whakaaro he nui ake te ariā o ngā raruraru mahi i te ariā o ngā raruraru whakatau. Heoi, ehara tenei i te mea pono, na te mea ka taea te whakarereke i nga raruraru mahi hei raruraru whakatau. Hei tauira, ka taea te whakarea o ngā tau tōpū e rua hei huinga o ngā toru (a, b, c) kia mau ai te pātahitanga a × b = c. Ko te whakatau mēnā he mema o tēnei huinga tētahi toru kua hoatu, e ōrite ana ki te whakaoti i te raruraru o te whakarea i ngā tau e rua.