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Math Addition

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.
Adding three apples.

Single Digit Addition

1 + 1

=

5 + 7

=

1 + 9

=

6 + 0

=

2

12

10

6

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

Adding oranges for a sum of five.

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-

Three Apples:

Five Oranges:

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