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3. Write the numbers in columns and add them.

a. 536 + 243 = _______ b. 326 + 297 = _______

c. 399 + 455 = _______ d. 632 + 398 = _______

e. 273 + 189 = _______ f. 145 + 968 = _______

Addition oF 4-digit numBErS

Addition without regrouping

Example 1. Add 2326 and 4272.
Solution. Write the numbers in columns and add them.

Step 1. Add the ones. 6 + 2 = 8 ones
Th H T O
Step 2. Add the tens. 2 + 7 = 9 tens 2 3 2 6

Step 3. Add the hundreds. 3 + 2 = 5 hundreds + 4 2 7 2
Step 4. Add the thousands. 2 + 4 = 6 thousands
6 5 9 8
Therefore, 2326 + 4272 = 6598.

Example 2. Add 2052, 6705 and 130.

Solution. Write the numbers in columns and add them.
Th H T O
Step 1. Add the ones. 2 + 5 + 0 = 7 ones
2 0 5 2
Step 2. Add the tens. 5 + 0 + 3 = 8 tens 6 7 0 5

Step 3. Add the hundreds. 0 + 7 + 1 = 8 hundreds + 1 3 0

Step 4. Add the thousands. 2 + 6 = 8 thousands
8 8 8 7
Therefore, 2052 + 6705 + 130 = 8887.

Exercise 2C

1. Add together:

a. 1 2 4 5 b. 3 4 5 0 c. 1 3 4 5 d. 5 9 2 1
+ 2 6 3 4 + 4 5 4 9 + 6 3 2 3 + 1 0 3 4

44 Mathematics 3