Page 47 - Touchpad Mathematics_Ver1.0_C4

2. Add the following:

a. 2 4 5 3 b. 2 2 0 1 c. 2 1 3 1 d. 3 4 0 4

4 3 2 2 2 3 3 4 6 3 4 5 1 0 8 3
+ 1 1 2 4 + 1 4 2 5 + 1 4 0 2 + 2 1 2

3. Write the numbers in columns and find the sum.

a. 1622 + 3104 b. 6345 + 2032 c. 1220 + 2102

d. 6735 + 3143 e. 3456 + 1243 f. 5440 + 3432

g. 3045 + 1242 h. 2814 + 3152 i. 7345 + 2654

j. 6625 + 2163 k. 1501 + 1242 l. 5302 + 3453

m. 4031 + 1056 + 200 n. 2444 + 1134 + 2110 o. 5333 + 1120 + 2020

Addition with regrouping

Example 1. Add: 4549 + 3422
Solution. Write the numbers in columns correctly and add them.

Step 1. Add the ones and regroup.
Th H T O
9 + 2 = 11 ones = 1 ten 1 one
1
Step 2. Add the tens. 1 + 4 + 2 = 7 tens
4 5 4 9
Step 3. Add the hundreds. 5 + 4 = 9 hundreds + 3 4 2 2

Step 4. Add the thousands. 4 + 3 = 7 thousands
7 9 7 1
Therefore, 4549 + 3422 = 7971.

Example 2. Add: 8456 + 1345

Solution. Write the numbers in columns correctly and add them.

Step 1. Add the ones and regroup.

6 + 5 = 11 ones = 1 ten 1 one
Th H T O
Step 2. Add the tens and regroup.
1 1
1 + 5 + 4 = 10 tens = 1 hundred 0 tens
8 4 5 6
Step 3. Add the hundreds. 1 + 4 + 3 = 8 hundreds
+ 1 3 4 5
Step 4. Add the thousands. 8 + 1 = 9 thousands
9 8 0 1
Therefore, 8456 + 1345 = 9801.

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Addition