Adding Numbers
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
- Uses math integers,
- Can include fractions or decimal values,
- The “+” addition sign between quantities summed,
- Use “=” (equal to) math sign to separate quantities
summed from their sum, and
- 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.
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.
Five Oranges
83
7
+ 49
139
Can be written or expressed as:
80
0 40
120
+
+
+
+
3
7
9
19
=
=
=
=
83
7
49
139
-or-
03
80
83
+
+
+
7
0
7
+
+
+
9
40
49
=
=
=
19
120
139
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
100
800
300
1,200
+
+
+
+
20
30
60
110
+
+
+
+
5
9
2
16
=
=
=
=
125
839
362
1,326
-or-
005
020
100
125
+
+
+
+
9
30
800
839
+
+
+
+
2
60
300
392
=
=
=
=
16
110
1,200
1,326
By adding two triple digit numbers the largest value that can be obtained is 1998, the sum of 999 and 999.
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