Question
Express $164\ mm$ as cm using decimal.
✓
Answer
$164\ mm = (100 + 64)\ mm = 100 \ mm + 64\ mm$
$= \frac { 100 } { 10 } \mathrm { \ cm } { + \frac { 64 } { 10 } } \mathrm { \ cm } .........[\because 1\ mm= \frac{1}{10} \ cm]$
$= 10 \ cm + 6.4 \ cm$
$= (10 + 6.4) \ cm$
$= (10 + 6 + 0.4) \ cm = (16 + 0.4) \ cm = 16.4 \ cm$
$= \frac { 100 } { 10 } \mathrm { \ cm } { + \frac { 64 } { 10 } } \mathrm { \ cm } .........[\because 1\ mm= \frac{1}{10} \ cm]$
$= 10 \ cm + 6.4 \ cm$
$= (10 + 6.4) \ cm$
$= (10 + 6 + 0.4) \ cm = (16 + 0.4) \ cm = 16.4 \ cm$
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