Tag: multiplication of division of decimal fraction by whole number and decimal fraction

$7.854$

$0.05 \times 0.09 \times 5$

In option A,

$5.\overline { 07 } \quad \times 10=50.7070707=50.7\overline { 07 } $

Multiples of 72 = 2,4,6,8,9,12,18,24,36,72
But in a year we have only 12 months and in a month we have only 30 days
So We have
$24.3.72 = 24\times 3 = 72$
$18.4.72 = 18\times 4 = 72$
$12.6.72= 12\times6 = 72$
$9.8.72 = 9\times8 = 72$
$8.9.72 = 8\times 9 = 72$
$6.12.72 = 6\times 12 = 72$

The rule of thumb in multiplying decimal numbers is we'll count the decimals from the right-hand side and the total places in the decimal in the question will be in the answer.

$14.79\times 1000 = 14790$

$0.126\times100$

$0.777=7\times 0.111$
$=7\times \frac {1}{9}=\frac {7}{9}$