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# Q.7 Find answers to the following. Write and indicate how you solved them. (a) Is $$\frac{5}{9}$$ equal to $$\frac{4}{5}$$ (b) Is $$\frac{9}{16}$$ equal to $$\frac{5}{9}$$ (c) Is $$\frac{4}{5}$$ equal to $$\frac{16}{20}$$ (d) Is $$\frac{1}{15}$$ equal to $$\frac{4}{30}$$

(a) Is $$\frac{5}{9}$$ equal to $$\frac{4}{5}$$
by cross multiplication
5 × 5 $$\square$$ 9 × 4
25 $$\neq$$ 36
$$\frac{5}{9}$$ $$\neq$$ $$\frac{4}{5}$$
(b) Is $$\frac{9}{16}$$ equal to $$\frac{5}{9}$$
by cross multiplication
9 × 9 $$\square$$ 16 × 5
81 $$\neq$$ 80
$$\frac{9}{16}$$ $$\neq$$ $$\frac{5}{9}$$
(c) Is $$\frac{4}{5}$$ equal to $$\frac{16}{20}$$
by cross multiplication
20 × 4 $$\square$$ 16 × 5
80 = 80
$$\frac{4}{5}$$ $$\neq$$ $$\frac{16}{20}$$
(d) Is $$\frac{1}{15}$$ equal to $$\frac{4}{30}$$
by cross multiplication
30 × 1 $$\square$$ 4 × 15
30 $$\neq$$ 60
$$\frac{1}{15}$$ $$\neq$$ $$\frac{4}{30}$$