Whakaoti i te 31/5div8/5*21/10

$$3 \frac { 1 } { 5 } \div \frac { 8 } { 5 } \times 2 \frac { 1 } { 10 }$$

Aromātai

$$\frac{21}{5}=4.2$$

Ngā Upane Otinga

Whakawehe \frac{3\times 5+1}{5} ki te \frac{8}{5} mā te whakarea \frac{3\times 5+1}{5} ki te tau huripoki o \frac{8}{5}.

$$\frac{\left(3\times 5+1\right)\times 5}{5\times 8}\times \frac{2\times 10+1}{10}$$

Me whakakore tahi te 5 i te taurunga me te tauraro.

$$\frac{1+3\times 5}{8}\times \frac{2\times 10+1}{10}$$

Whakareatia te 3 ki te 5, ka 15.

$$\frac{1+15}{8}\times \frac{2\times 10+1}{10}$$

Tāpirihia te 1 ki te 15, ka 16.

$$\frac{16}{8}\times \frac{2\times 10+1}{10}$$

Whakawehea te 16 ki te 8, kia riro ko 2.

$$2\times \frac{2\times 10+1}{10}$$

Whakareatia te 2 ki te 10, ka 20.

$$2\times \frac{20+1}{10}$$

Tāpirihia te 20 ki te 1, ka 21.

$$2\times \frac{21}{10}$$

Tuhia te 2\times \frac{21}{10} hei hautanga kotahi.

$$\frac{2\times 21}{10}$$

Whakareatia te 2 ki te 21, ka 42.

$$\frac{42}{10}$$

Whakahekea te hautanga \frac{42}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$\frac{21}{5}$$

Tauwehe

$$\frac{3 \cdot 7}{5} = 4\frac{1}{5} = 4.2$$