Teaching Fractions and Ratios for Understanding by Lamon Susan J.;

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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