Whakaoti i te 12/5*21/4

$$1 \frac { 2 } { 5 } \times 2 \frac { 1 } { 4 }$$

Aromātai

$$\frac{63}{20}=3.15$$

Ngā Upane Otinga

Whakareatia te 1 ki te 5, ka 5.

$$\frac{5+2}{5}\times \frac{2\times 4+1}{4}$$

Tāpirihia te 5 ki te 2, ka 7.

$$\frac{7}{5}\times \frac{2\times 4+1}{4}$$

Whakareatia te 2 ki te 4, ka 8.

$$\frac{7}{5}\times \frac{8+1}{4}$$

Tāpirihia te 8 ki te 1, ka 9.

$$\frac{7}{5}\times \frac{9}{4}$$

Me whakarea te \frac{7}{5} ki te \frac{9}{4} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$\frac{7\times 9}{5\times 4}$$

Mahia ngā whakarea i roto i te hautanga \frac{7\times 9}{5\times 4}.

$$\frac{63}{20}$$

Tauwehe

$$\frac{3 ^ {2} \cdot 7}{2 ^ {2} \cdot 5} = 3\frac{3}{20} = 3.15$$