kungfu math p4 slide13 (subtraction decimals)pdf

• subtraction of decimals (up to 2 decimal places)

What will we learn today?

Decimals Subtraction

In the previous lecture, we have learnt about addition in decimals.

Let’s recap!

Addition in Decimals

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

In the previous lecture, we have learnt about addition in decimals.

Let us learn about

subtraction in decimals today.

Subtraction in Decimals

1. Find the value of 13.04 – 2.01

Try this out!

1. Find the value of 13.04 – 2.01

Align the decimal numbers using the decimal point.

Do the workings accordingly.

13.04

- 2.01

Try this out!

1. Find the value of 13.04 – 2.01

Align the decimal numbers using the decimal point.

Do the workings accordingly.

13.04

- 2.01

11.03

Applying what we have learnt

Try this out!

Mr Li used 2.5kg of rice on Monday and 1.75 kg on Tuesday. He used a total of 9 kg Monday and Wednesday. How much rice did he use on

Wednesday?

Solution

Mr Li used 2.5kg of rice on Monday and 1.75 kg more on Tuesday. He used a total of 9 kg from Monday to Wednesday.

How much rice did he use on Wednesday?

Step 1: 2.5kg + 1.75kg =___kg

Solution

Mr Li used 2.5kg of rice on Monday and 1.75 kg more on Tuesday. He used a total of 9 kg from Monday to Wednesday.

How much rice did he use on Wednesday?

2.50

+ 1.75

Step 1: 2.5kg + 1.75kg = 4.25kg

He used 4.25kg of rice on Tuesday.

Solution

Mr Li used 2.5kg of rice on Monday and 1.75 kg more on Tuesday. He used a total of 9 kg from Monday to Wednesday.

How much rice did he use on Wednesday?

2.50

+ 4.25

Step 2: 2.5kg + 4.25kg = 6.75kg

He used 6.75kg of rice on Monday and Tuesday.

Solution

Mr Li used 2.5kg of rice on Monday and 1.75 kg more on Tuesday. He used a total of 9 kg from Monday to Wednesday.

How much rice did he use on Wednesday?

9.00

- 6.75

Step 3: 9.00 kg - 6.75kg = 2.25 kg

He used 2.25kg of rice on Wednesday.

Are you ready to try out the questions?

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