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 Question from Hannah: I do not understand it...... What is the scale factor for 9 centimeters = 1 meter

HI Hannah,

1 meter is 100 centimeters so you want a scale that will take 9 centimeters to 100 centimeters. Since

$9 \times \frac{100}{9} = 100$

the scale factor is $\large \frac{100}{9}.$

Penny