RP Fractions help.?
Problem 1:
a) Change the following RP fraction to statement in words:
1: 100 000 means 1 cm= _________ km
*my friend said the shortcut to do it is to start at the decimal (the end of 0) and work back five times
so: 1:100 000 means 1 cm= 1 km
What i dont get is the next problem:
b) 1: 50 000 means 1 cm= ________ km
if i go back 5 times I’d end up with…nothing.
and then this next problem:
c) 1:124 000 means 1 cm = ________km
if i go back five times, i’d end up with: 1 km. which is the same answer to problem a). and that can’t be right.
can anyone help?
Favorite Answer
That means there are
100 * 1000
= 100,000cm in 1km.
When you write an RP fraction, put ‘cm’ after both measurements, and then convert the ‘cm’ on the right to ‘km’ by dividing by 100,000. Your friend’s rule is right for this conversion.
1:100,000
= 1cm : 100,000cm
= 1cm : 1km.
1cm. = 1km.
1:50,000
= 1cm: 50,000cm
= 1cm: 0.5km.
1cm = 0.5km
The decimal point can go left of the numbers.
If it needed to go further still, you would get 0.05km, 0.005km and so on.
1:124,000
= 1cm: 124,000cm
= 1cm: 1.24km
1cm = 1.24km.
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