Decimals - PowerPoint PPT Presentation

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Decimals

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Decimals What is to be learned? How to read decimals from a scale Why Have Decimals? What is to be learned? How to add/subtract decimals Adding and Subtracting Adding ... – PowerPoint PPT presentation

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Title: Decimals


1
Decimals
2
What is to be learned?
  • How to read decimals from a scale

3
Why Have Decimals?
Difficult to eat a whole mammoth by yourself!
4
invented by?
Abu'l-Hasan al-Uqlidisi
5
Tenths
5
6
5.1
5.5
6
Tenths
7
8
7.3
7.9
7
Tenths
7
8
between 7 and 7.1
7.3
7.9
Hundredths
7
7.1
7.06
7.01
8
Hundredths
6.4
6.5
6.41
6.49
9
Estimate Hundredths
2
3
2.19
2.92
2.6
2.60
2.6 is higher than 2.19
10
What is to be learned?
  • How to add/subtract decimals

11
Adding and Subtracting
2.1 17.8
.
2.1
17.8

9
9
1
19.7 6
.0
19.7
6.0
.
13 7
12
Adding/Subtracting Decimals
  • Steps to success

Remember the snowman
Line up decimal points
Add/subtract as normal
Put decimal point in answer
.
3.2
12.4

15 6
13
The Test of Success
What is to be learned?
Steps to success Line up decimal
points Add/Subtract as normal Put Decimal Point
in Answer
How to add/subtract decimals
4.35 17
.0
.
4.35
17.0
21 35
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