Post on 09-Jun-2015
• 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?
Find the sum of 1369 and 5240.
a) 3871
b) 3889
c) 6509
d) 6609
The word ‘sum’ refers to addition of the numbers.
Find the sum of 1369 and 5240.
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?
Find the sum of 1369 and 5240.
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?
3 thousands + 7 hundreds + 5 ones =____
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?
3 thousands + 7 hundreds + 5 ones =____
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?