Whakaoti i te 21.08+21/5-12.90=

$$21.08 + 2 \frac { 1 } { 5 } - 12.90 =$$

Aromātai

$$10.38$$

Ngā Upane Otinga

Whakareatia te 2 ki te 5, ka 10.

$$21.08+\frac{10+1}{5}-12.9$$

Tāpirihia te 10 ki te 1, ka 11.

$$21.08+\frac{11}{5}-12.9$$

Me tahuri ki tau ā-ira 21.08 ki te hautau \frac{2108}{100}. Whakahekea te hautanga \frac{2108}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 4.

$$\frac{527}{25}+\frac{11}{5}-12.9$$

Ko te maha noa iti rawa atu o 25 me 5 ko 25. Me tahuri \frac{527}{25} me \frac{11}{5} ki te hautau me te tautūnga 25.

$$\frac{527}{25}+\frac{55}{25}-12.9$$

Tā te mea he rite te tauraro o \frac{527}{25} me \frac{55}{25}, me tāpiri rāua mā te tāpiri i ō raua taurunga.

$$\frac{527+55}{25}-12.9$$

Tāpirihia te 527 ki te 55, ka 582.

$$\frac{582}{25}-12.9$$

Me tahuri ki tau ā-ira 12.9 ki te hautau \frac{129}{10}.

$$\frac{582}{25}-\frac{129}{10}$$

Ko te maha noa iti rawa atu o 25 me 10 ko 50. Me tahuri \frac{582}{25} me \frac{129}{10} ki te hautau me te tautūnga 50.

$$\frac{1164}{50}-\frac{645}{50}$$

Tā te mea he rite te tauraro o \frac{1164}{50} me \frac{645}{50}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{1164-645}{50}$$

Tangohia te 645 i te 1164, ka 519.

$$\frac{519}{50}$$

Tauwehe

$$\frac{3 \cdot 173}{2 \cdot 5 ^ {2}} = 10\frac{19}{50} = 10.38$$