• # question_answer 21) Express as metres using decimals. (a) 15 cm (b) 6 cm (c) 2 m 45 cm (d) 9 m 7 cm (e) 419 cm TIPS As we know that, $=\frac{20}{10}+\frac{5}{10}=\frac{20+5}{10}=\frac{25}{10}$$=\frac{25\div 5}{10\div 5}=\frac{5}{2}$ So, to express cm as m, multiply cm by $\because$(i.e. hundredths).

Answer:

(a) We know that, $\therefore$ $2.5=\frac{25}{10}$ $=\frac{5}{2}$ (b) We know that, $1.0=1+\frac{0}{10}=1+0=1$ $\therefore$$3.8=3+\frac{8}{10}=\frac{3\times 10}{1\times 10}+\frac{8}{10}$ (c) We know that, $=\frac{30}{10}+\frac{8}{10}=\frac{30+8}{10}=\frac{38}{10}$ $\frac{38\div 2}{10\div 2}=\frac{19}{5}$ $\because$ $\therefore$(d) We know that, $3.8=\frac{38}{10}$ $=\frac{19}{5}$ $13.7=13+\frac{7}{10}=\frac{13\times 10}{1\times 10}+\frac{7}{10}$ $=\frac{130}{10}+\frac{7}{10}=\frac{130+7}{10}=\frac{137}{10}$ (e) We know that, $\frac{137\div 1}{10\div 1}=\frac{137}{10}$ $\because$$\therefore$

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