Whakaoti i te 2/5*3/10*21/2*4

$$\frac { 2 } { 5 } \times \frac { 3 } { 10 } \times 2 \frac { 1 } { 2 } \times 4$$

Aromātai

$$\frac{6}{5}=1.2$$

Ngā Upane Otinga

Me whakarea te \frac{2}{5} ki te \frac{3}{10} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$\frac{2\times 3}{5\times 10}\times \frac{2\times 2+1}{2}\times 4$$

Mahia ngā whakarea i roto i te hautanga \frac{2\times 3}{5\times 10}.

$$\frac{6}{50}\times \frac{2\times 2+1}{2}\times 4$$

Whakahekea te hautanga \frac{6}{50} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$\frac{3}{25}\times \frac{2\times 2+1}{2}\times 4$$

Whakareatia te 2 ki te 2, ka 4.

$$\frac{3}{25}\times \frac{4+1}{2}\times 4$$

Tāpirihia te 4 ki te 1, ka 5.

$$\frac{3}{25}\times \frac{5}{2}\times 4$$

Me whakarea te \frac{3}{25} ki te \frac{5}{2} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro.

$$\frac{3\times 5}{25\times 2}\times 4$$

Mahia ngā whakarea i roto i te hautanga \frac{3\times 5}{25\times 2}.

$$\frac{15}{50}\times 4$$

Whakahekea te hautanga \frac{15}{50} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 5.

$$\frac{3}{10}\times 4$$

Tuhia te \frac{3}{10}\times 4 hei hautanga kotahi.

$$\frac{3\times 4}{10}$$

Whakareatia te 3 ki te 4, ka 12.

$$\frac{12}{10}$$

Whakahekea te hautanga \frac{12}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$\frac{6}{5}$$

Tauwehe

$$\frac{2 \cdot 3}{5} = 1\frac{1}{5} = 1.2$$