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

units.

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.

1/2

—-

1/4

is a complex fraction …. really? Only if fractions are not numbers!!!!!!!

More on fractions in a later post…………………………………….

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