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Welcome to Year 3 Mathematics
Lessons & Assignments




WEEK 6


Meaning of Sum
What is sum?
In mathematics, sum is the answer we get by adding two or more numbers together.





Find the doubles.

Double means adding the same number together.
Example 1
What is the double of 14?
14 + 14 = 28

Example 2
What is the double of 65?
65 + 65 = 130

Example 3
What is the double of 320?
320 + 320 = 640

Adding Tens and Hundreds
2789 +10 =
2799

3084 +40 =
3124

7063 +200 =
7263

5119 +900 =
6019

Addition without Regrouping
Find the sum of 1357 and 5241.

Step 1 : Add the ones.
Step 2 : Add the tens.
Step 3 : Add the hundreds.
Step 4 : Add the thousands.

Add from right to left.
The sum of 2000 and 7876 is .
9876


Add from right to left.
Add 5042 and 3857.

Add from right to left.

1445 +3 =
1448

9571 +28 =
9599

4152 + 736 =
4888

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