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Math addition is the application of established properties, rules and methods to sum numeric quantities. Simple addition only considers positive whole numbers.

## Properties of Addition

1. Uses math integers,
2. Can include fractions or decimal values,
3. The “+” addition sign between quantities summed,
4. Use “=” (equal to) math sign to separate quantities summed  from their sum, and
5. Sums (answers) can be zero or positive values. Three Apples:

## Single Digit Addition

1 + 1

=

2

5 + 7

=

12

1 + 9

=

10

6 + 0

=

6

By adding two single digit numbers the largest value that can be obtained is 18,  the sum of 9 and 9. Five Oranges:

## Double Digit Addition

2 digit addition when one or more numbers is 2 digits.

34

+ 27

61

Can be written or expressed as:

30

20

50

+

+

+

4

7

11

=

=

=

34

27

61

-or-

4

3034

+

+

+

7

2027

=

=

=

11

50

61

By adding two double digit numbers the largest value that can be obtained is 198,  the sum of 99 and 99.

83

7

+ 49

139

80

0 40

120

+

+

+

+

3

7

9

19

=

=

=

=

83

7

49

139

Can be written or expressed as:

-or-

03

80

83

+

+

+

+

+

+

7

0

7

=

=

=

19

120

139

9

40

49

## 3 Digit Addition

Triple digit addition when one or more numbers is 3 digits.

125

839

+ 362

1,326

Can be written or expressed as:

125 + 839 + 362 = 1,326

-or-

=

=

=

=

125

839

362

1,326

20

30

60

110

+

+

+

+

5

9

2

16

100

800

300

1,200

+

+

+

+

005

020

100

125

+

+

+

+

9

30

800

839

=

=

=

=

+

+

+

+

2

60

300

392

16

110

1,200

1,326

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