Page 39 - Math Genius C3

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Example 1: Find the sum of 6043 and 2954.

Solution: Write the number in columns and use the following steps:
Step 1: Add the ones. 3 + 4 = 7 ones

Write 7 in the ones column.
Step 2: Add the tens. 4 + 5 = 9 tens th H t O

Write 9 in the tens column.
Step 3: Add the hundreds. 0 + 9 = 9 hundreds 6 0 4 3
Write 9 in the hundreds column. + 2 9 5 4

Step 4: Add the thousands. 6 + 2 = 8 thousands 8 9 9 7
Write 8 in the thousands column.

Thus, the sum of 6043 and 2954 is 8997.
Addition of three 4-digit numbers

Adding three 4-digit numbers is the same as adding three 3-digit numbers.
Example 2: Find the sum of 1632, 2140 and 3117.
Solution: Write the numbers in the place value columns and add using the

following steps:
Step 1: Add the ones. 2 + 0 + 7 = 9 ones th H t O

Step 2: Add the tens. 3 + 4 + 1 = 8 tens 1 6 3 2
Step 3: Add the hundreds. 6 + 1 + 1 = 8 hundreds 2 1 4 0

Step 4: Add the thousands. 1 + 2 + 3 = 6 thousands + 3 1 1 7
Thus, the sum of 1632, 2140 and 3117 is 6889. 6 8 8 9

practice time 2C

1. Add the following.
(a) th H t O (b) th H t O (c) th H t O

4 4 2 1 5 6 0 4 5 4 2 7
+ 2 5 1 7 + 4 0 4 0 + 3 5 4 0

(d) th H t O (e) th H t O (f) th H t O

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

Mathematics-3 37