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Milk costs $4.50 for 4 L. What is the unit price?
COST  Litres
$4.50 X 1/4  4 X 1/4

$1.13  1
Ratio as a quotient:
$4.50 divided by 4 L of milk
Ratio as a rate:
Milk is $1.13 per litre of milk
I have to get used to thinking of multiplying by a fraction instead of dividing. I’m curious as to why this is easier for kids. Don’t they still have to think about division to “do the math”?
I am interested in moving farther and seeing how to do this algebraically. I’ve always found the input/output “machines” (table of values) that are found in MMS texts starting about gr. 4 (?) to be very confusing – not only for kids! I wonder: how does this turn into graphing linear relations? Looking forward to finding out!
 This reply was modified 2 years, 6 months ago by marianne aamodt. Reason: formatting of chart did not work when posted