ED2652 Lecture Notes - Lecture 2: Decimal Mark

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1 Jun 2018
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Tutorial 2 Maths 2
Decimal Fractions
Lesson Closure
- Whats the take hoe essage
Questions from Reading:
1. Why is an understanding of place value so important to a deep
understanding of decimal fractions
- The relationship between each place
o One of these is 10 of those
o Relationship is x10
The relationship between the places is the base 10
system
Move left x10, move right divide by 10
2. What are the pros and cons of using money to introduce decimal
fractions
- Cons
o The reading of the numbers is different (Terminology)
o Money only goes to 2 decimal points
o E.g. e dot hae $7.13
- Pros
o Its real orld otet eaig kids ould e ore egaged
Kids are familiar with money
Misconceptiosn of Decimal Fractions
- A decimal point is like punctuation or a decoration
- A decimal point separates two whole numbers (using money or
measurement as a context can promote this)
- In decimals numbers on the right are different in some way
o Some misconceptions which may arise before understanding
develops
o Longer is larger
o Shorter is larger
o The place value columns reverse after the decimal point
a use oeths
o Decimal point separates the whole numbers from negative
numbers
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