Whakaoti i te (3/20+7/30)*15

$$( \frac { 3 } { 20 } + \frac { 7 } { 30 } ) \cdot 15$$

Aromātai

$$\frac{23}{4}=5.75$$

Ngā Upane Otinga

Ko te maha noa iti rawa atu o 20 me 30 ko 60. Me tahuri \frac{3}{20} me \frac{7}{30} ki te hautau me te tautūnga 60.

$$\left(\frac{9}{60}+\frac{14}{60}\right)\times 15$$

Tā te mea he rite te tauraro o \frac{9}{60} me \frac{14}{60}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$\frac{9+14}{60}\times 15$$

Tāpirihia te 9 ki te 14, ka 23.

$$\frac{23}{60}\times 15$$

Tuhia te \frac{23}{60}\times 15 hei hautanga kotahi.

$$\frac{23\times 15}{60}$$

Whakareatia te 23 ki te 15, ka 345.

$$\frac{345}{60}$$

Whakahekea te hautanga \frac{345}{60} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 15.

$$\frac{23}{4}$$

Tauwehe

$$\frac{23}{2 ^ {2}} = 5\frac{3}{4} = 5.75$$