2/3 - 1/4 = 2. 2/5 - 1/5 = 3. 3/20 - 9/20 = 4. 5/9 - 2/4 = 5. 8/15 - 10/30 =

Badilisha sehemu kuwa na kigawo cha kawaida.

$$\frac{3}{5} = \frac{3 \times 4}{5 \times 4} = \frac{12}{20}$$ $$\frac{1}{4} = \frac{1 \times 5}{4 \times 5} = \frac{5}{20}$$

$$\frac{12}{20} - \frac{5}{20} = \frac{12 - 5}{20} = \frac{7}{20}$$

Jibu: $\boxed{\frac{7}{20}}$

2. $\frac{6}{8} - \frac{2}{5}$

Kisha, tafuta LCM ya 4 na 5, ambayo ni 20. Badilisha sehemu kuwa na kigawo cha kawaida.

$$\frac{3}{4} = \frac{3 \times 5}{4 \times 5} = \frac{15}{20}$$ $$\frac{2}{5} = \frac{2 \times 4}{5 \times 4} = \frac{8}{20}$$

$$\frac{15}{20} - \frac{8}{20} = \frac{15 - 8}{20} = \frac{7}{20}$$

Jibu: $\boxed{\frac{7}{20}}$

3. $\frac{4}{20} - \frac{3}{20}$

Toa namba za juu (numerators) moja kwa moja.

$$\frac{4}{20} - \frac{3}{20} = \frac{4 - 3}{20} = \frac{1}{20}$$

Jibu: $\boxed{\frac{1}{20}}$

4. $\frac{5}{9} - \frac{2}{7}$

Badilisha sehemu kuwa na kigawo cha kawaida.

$$\frac{5}{9} = \frac{5 \times 7}{9 \times 7} = \frac{35}{63}$$ $$\frac{2}{7} = \frac{2 \times 9}{7 \times 9} = \frac{18}{63}$$

$$\frac{35}{63} - \frac{18}{63} = \frac{35 - 18}{63} = \frac{17}{63}$$

Jibu: $\boxed{\frac{17}{63}}$

5. $\frac{8}{15} - \frac{10}{30}$

Kisha, tafuta LCM ya 15 na 3, ambayo ni 15. Badilisha sehemu kuwa na kigawo cha kawaida.

$$\frac{1}{3} = \frac{1 \times 5}{3 \times 5} = \frac{5}{15}$$

$$\frac{3}{15} = \frac{1}{5}$$

Jibu: $\boxed{\frac{1}{5}}$