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Find:
$(i).\ 7.9 \div 1000$
$(ii).\ 26.3 \div 1000$
$(iii).\ 38.53 \div 1000$
$(iv).\ 128.9 \div 1000$
$(v).\ 0.5 \div 1000$
To do:
We have to find
(i) $7.9 \div 1000$
(ii) $26.3 \div 1000$
(iii) $38.53 \div 1000$
(iv) $128.9 \div 1000$
(v) $0.5 \div 1000$
Solution:
We know that,
On dividing a decimal by $10^n$, the decimal point shifts to the left by $n$ places.
$\frac{a}{b} \div \frac{c}{d} = \frac{a}{b} \times \frac{d}{c}$
Therefore,
(i) $7.9\div1000=\frac{79}{10}\times\frac{1}{1000}$
$=\frac{79}{10000}$
$=0.0079$
(ii) $26.3\div1000=26.3\times\frac{1}{1000}$
$=\frac{263}{10}\times\frac{1}{1000}$
$=\frac{263}{10000}$
$=0.0263$
(iii) $38.53\div1000=38.53\times\frac{1}{1000}$
$=\frac{3853}{100}\times\frac{1}{1000}$
$=\frac{3853}{100000}$
$=0.03853$
(iv) $128.9\div1000=128.9\times\frac{1}{1000}$
$=\frac{1289}{10}\times\frac{1}{1000}$
$=\frac{1289}{10000}$
$=0.1289$
(v) $0.5\div1000=0.5\times\frac{1}{1000}$
$=\frac{5}{10}\times\frac{1}{1000}$
$=\frac{5}{10000}$
$=0.0005$