Add Whole Numbers
Adding Three Digit Numbers
Adding two three digit numbers (for example 529 + 733) involves several
steps.
 Place one number above the other so that the hundreds, tens and ones
places are lined up. Draw a line under the bottom number.
529
733
 Add the ones place digits (9 + 3 = 12). This number is larger than 10 so
place a one above the tens place column and place the two below the line
in the ones place column.
1
529
733
2
 Add the tens place digits (1 + 2 + 3 = 6) and place the answer below the
line and in the tens place column.
529
733
62
 Add the numbers in the hundreds place column (5 + 7 = 12) and place the
2 below the line and before the other number below the line. Place the 1
from the twelve above the thousands place column.
1
529
733
262
 The thousands place column only has a 1 in it which should be placed
below the line in the thousands place column.
529
733
1262
Calculator Practice
Adding numbers is a task everyone does daily. Practice without
a pencil and scratch paper builds brain connections. The exercises given are
intended to be used as a learning tool to improve mathematical manipulation, and
also as practice in the accurate use of a calculator.
Find a practice worksheet HERE.
Find audio support HERE.
Addition Table
This addition chart should be recited from memory without
reference to strengthen addition principles and memory connections.
Directions: Add each number on the left side of the table to
each number across the top of the table. Where the lines interest is the sum of
these two numbers. Look for patterns to aid memorization.

1

2

3

4

5

6

7

8

9

10

1

2

3

4

5

6

7

8

9

10

11

2

3

4

5

6

7

8

9

10

11

12

3

4

5

6

7

8

9

10

11

12

13

4

5

6

7

8

9

10

11

12

13

14

5

6

7

8

9

10

11

12

13

14

15

6

7

8

9

10

11

12

13

14

15

16

7

8

9

10

11

12

13

14

15

16

17

8

9

10

11

12

13

14

15

16

17

18

9

10

11

12

13

14

15

16

17

18

19

10

11

12

13

14

15

16

17

18

19

20

