Teaching Fractions and Ratios for Understanding by Lamon Susan J.;
Author:Lamon, Susan J.;
Language: eng
Format: epub
Publisher: Taylor & Francis Group
Published: 2020-08-15T00:00:00+00:00
Both approaches are illustrated below. If you cannot do this in your head, ratio tables are a convenient tool for recording your reasoning process.
Reasoning with Percentages
•32 = ____% of 40.
I will start with the given and scale up until I get 100 in the denominator.
32
64
16
80
40
80
20
100
is equivalent to or 80%.
Another way: begin with a % that you know (say 50%) and reason to 80%.
I know that 20 is 50% of 40
So 4 is 10% of 40
12 is 30% of 40
32 is 80 % of 40
•35% of _______ = 21?
I will start with the given and scale up/down toward 21 in the numerator.
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