How do you convert 2 1/2 meters to centimeters?

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Answer 1 · 2016-10-22T07:47:56

$2.5 xx 100 = 250 cm$

The prefix 'cent' means 100. [Century is 100 years, $100c = $1$ ]

In $1 " metre "$ there are $100 " centimetres"$

To change metres $rarr$ cm, multiply by 100.

(move the decimal point 2 places to the right)

If you change to a smaller unit, the number gets bigger.

$2 1/2 m = 2.5m" "larr$ write as a decimal

$2.5 xx 100 = 250 cm$

Answer 2 · 2016-10-27T10:11:23

$2 1/2" metres "= 250" centimetres"$

Known: $" "color(brown)( 1" metre "= 100" centimetres" )$

But we need $2 1/2$ metres

Multiply both sides by $2 1/2$

$color(brown)( color(blue)( 2 1/2xx)1" metre "= color(blue)(2 1/2xx)100" centimetres" )$

$2 1/2" metres "= 250" centimetres"$