Kungfu math p4 slide12 (addition decimals)pdf
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Transcript of Kungfu math p4 slide12 (addition decimals)pdf
• addition of decimals (up to 2 decimal places)
What will we learn today?
Decimals Addition
Let’s recap what we have learnt in the previous lecture.
Decimals
A Decimal Number
(based on the number 10)
contains a Decimal Point.
Examples:
230.01, 0.56, 1.20
Place Value
To understand decimal numbers, we must first know about Place Value.
When we write numbers,
the position (or "place") of each number is important.
Example
In the number 427:
the "7" is in the Units position, meaning just 7 (or 7 "1"s),
the "2" is in the Tens position meaning 2 tens (or twenty),
and the “4" is in the Hundreds position, meaning 4 hundreds.
In the number 427,
As we move to the left, each position is 10 times bigger!
From Units, to Tens, to Hundreds
427
In the number 427,
As we move to the right, each position is 10 times smaller.
427 From Hundreds, to Tens, to Units
If we pass the unit value,
we have to first write a decimal point
427.1 and this value is 10 times smaller than the units
Decimal Point
“four hundred twenty seven and one tenth" But,
we usually just say “four hundred twenty seven point one"
427.1
Decimal Point
The decimal point is the most important part of a Decimal Number.
It is exactly to the right of the Units position.
Without it, we would be lost ... and not know what each position meant.
With that, we can continue with smaller and smaller values, from tenths, to hundredths, and so on.
See the example below,
27.198
tenths hundredth
thousandth
units tens
decimal point
Try this out!
1. Find the value of 3.04 + 19.2
Try this out!
1. Find the value of 3.04 + 19.2
We need to understand that 19.2 is actually 19.20. The ‘0’ behind is the hundredths place. Since there is no value, we shall put a ‘0’ as denotation.
3.04
+ 19.20
Try this out!
1. Find the value of 3.04 + 19.2
Align the decimal numbers using the decimal point.
Do the workings accordingly.
3.04
+ 19.20
Try this out!
1. Find the value of 3.04 + 19.2
Align the decimal numbers using the decimal point.
Do the workings accordingly.
3.04
+ 19.20
22.24
Applying what we have learnt
Try this out!
2. Find the sum of 23.04 + 11.92
Try this out!
2. Find the sum of 23.04 + 11.92
Align the decimal numbers using the decimal point.
Do the workings accordingly.
Try this out!
2. Find the sum of 23.04 + 11.92
Align the decimal numbers using the decimal point.
Do the workings accordingly.
23.04
+ 11.92
Try this out!
2. Find the sum of 23.04 + 11.92
Align the decimal numbers using the decimal point.
Do the workings accordingly.
23.04
+ 11.92
34.96
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