Kungfu math p3 slide2 (addition)

• addition of numbers up to 4 digits

• use of the terms ‘sum’

What will we learn today?

Whole Numbers

Addition

Before we begin, let’s recall what is place values.

In the number 1245,

tens ones

In the number 1245,

thousands

hundreds

So, in a 4-digit number,

There are

Thousands place

Hundreds place

Tens place

Ones place

Find the sum of 1369 and 5240.

a) 3871

b) 3889

c) 6509

d) 6609

Did you notice the important information?


a) 3871

b) 3889

c) 6509

d) 6609

The word ‘sum’ refers to addition of the numbers.


a) 3871

b) 3889

c) 6509

d) 6609

By using workings, find the answer.

Counter-check your workingswith mine on the next page.

1369+ 5240

6609

+1

Did you get the same answer?


a) 3871

b) 3889

c) 6509

d) 6609

Here’s another example.

3 thousands + 7 hundreds + 5 ones =____

a) 375

b) 3075

c) 3705

d) 3750

Do you need any help?


a) 375

b) 3075

c) 3705

d) 3750

Write down the values for all given information.

3 thousands + 7 hundreds + 5 ones =____ 3000 700 5

a) 375

b) 3075

c) 3705

d) 3750

Write down the values for all given information.

3 thousands + 7 hundreds + 5 ones =____ 3000 700 5

a) 375

b) 3075

c) 3705

d) 3750

Add the values together.

3000+ 700_____5

3705Did you get the same answer?


a) 375

b) 3075

c) 3705

d) 3750

Here’s an example.

2139 + ______ = 3507

a) 1368

b) 1432

c) 2588

d) 5646

Do you need any help?

2139 + ______ = 3507

a) 1368

b) 1432

c) 2588

d) 5646

Let’s work backwards.

2139 + ______ = 3507

a) 1368

b) 1432

c) 2588

d) 5646

To find the missing number, you need to do subtraction.

3507- 2139

3507- 2139

Since the value is insufficient, we shall borrow from the next place

value.

4 1

3507- 2139

4 19

3507- 2139

Do a simple subtraction.

4 19 1

3507- 2139

1368

Did you get the same answer?

4 19 1

2139 + ______ = 3507

a) 1368

b) 1432

c) 2588

d) 5646

Are you ready to try out the questions?

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