Reply To: Lesson 6-2: Unpacking Ratios – Discussion

[Krista-Lynne Edwards]

Multiplicative Comparison:

$2 compared to $8

$8 is 4 times greater than $2. $2 is 1/4 times as large as $8

This is from my grade 8 textbook. Many of the questions where looking just for the ratio to be written in ratio form or as a fraction. No emphasis on looking at the multiplicative thinking.

Composed Unit:

A black bear eats 22 kg of berries in 2 weeks. How many berries would the bear eat in 3 weeks? in 7 days?

I’ve never thought of ratios in this manner before. I find that multiplicative comparison for ratios is what I would generally use for ratios. With composed units, I naturally progress towards unit rates as soon as I see it. I think I can make more of the connection to ratios for composed units when I build a table with the information.

[Krista-Lynne Edwards]

Multiplicative Comparison:

$2 compared to $8

$8 is 4 times greater than $2. $2 is 1/4 times as large as $8

This is from my grade 8 textbook. Many of the questions where looking just for the ratio to be written in ratio form or as a fraction. No emphasis on looking at the multiplicative thinking.

Composed Unit:

A black bear eats 22 kg of berries in 2 weeks. How many berries would the bear eat in 3 weeks? in 7 days?

I’ve never thought of ratios in this manner before. I find that multiplicative comparison for ratios is what I would generally use for ratios. With composed units, I naturally progress towards unit rates as soon as I see it. I think I can make more of the connection to ratios for composed units when I build a table with the information.