Here are some gems from the CCSS math document.
CCSS grade 6
Apply and extend previous understandings of multiplication and
division to divide fractions by fractions.
How many 3/4-cup servings are in 2/3 of a cup of yogurt?
Well, I would say “None”
CCSS grade 7
Analyze proportional relationships and use them to solve real-world
and mathematical problems.
1. Compute unit rates associated with ratios of fractions, including ratios
of lengths, areas and other quantities measured in like or different
For example, if a person walks 1/2 mile in each 1/4 hour, compute
the unit rate as the complex fraction 1/2/1/4 miles per hour, equivalently 2 miles per hour.
And here we are asked to crack a nut with a sledgehammer.
Common sense to the rescue!
Half a mile in a quarter of an hour is one mile in half an hour and so 2 miles in one hour, or 2 miles per hour.
is a complex fraction …. really? Only if fractions are not numbers!!!!!!!
More on fractions in a later post…………………………………….