Kungfu math p4 slide12 (addition decimals)pdf

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addition of decimals (up to 2 decimal places) What will we learn today? Decimals Addition

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Transcript of Kungfu math p4 slide12 (addition decimals)pdf

Page 1: Kungfu math p4 slide12 (addition decimals)pdf

• addition of decimals (up to 2 decimal places)

What will we learn today?

Decimals Addition

Page 2: Kungfu math p4 slide12 (addition decimals)pdf

Let’s recap what we have learnt in the previous lecture.

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Decimals

A Decimal Number

(based on the number 10)

contains a Decimal Point.

Examples:

230.01, 0.56, 1.20

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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.

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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.

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In the number 427,

As we move to the left, each position is 10 times bigger!

From Units, to Tens, to Hundreds

427

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In the number 427,

As we move to the right, each position is 10 times smaller.

427 From Hundreds, to Tens, to Units

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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

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Decimal Point

“four hundred twenty seven and one tenth" But,

we usually just say “four hundred twenty seven point one"

427.1

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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.

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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

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Try this out!

1. Find the value of 3.04 + 19.2

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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

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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

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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

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Applying what we have learnt

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Try this out!

2. Find the sum of 23.04 + 11.92

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Try this out!

2. Find the sum of 23.04 + 11.92

Align the decimal numbers using the decimal point.

Do the workings accordingly.

Page 19: Kungfu math p4 slide12 (addition decimals)pdf

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

Page 20: Kungfu math p4 slide12 (addition decimals)pdf

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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Are you ready to try out the questions?

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