Adding and Subtracting Decimals. Lesson 15. The Basic Steps:. Line up the numbers by the decimal point. Fill in missing places with zeroes. Add or subtract. Addition Properties. Commutative Property of Addition: Numbers can be added in any order. Example: 5+3=3+5.
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Adding and Subtracting Decimals
Lesson 15
Commutative Property of Addition: Numbers can be added in any order.
Example: 5+3=3+5
Associative Property of Addition: Numbers can be grouped in any way.
Example: (7+3) + 5 = 7 + (3+5)
Identity Property of Addition: The sum of any number and zero is that number.
Example: 18 + 0 = 18
commutative
associative
This can estimate to 30 + 13, which is 43. (Compatible numbers)
28.9
0
+
13.31
42.21
The answer is close to the estimate.
0
1
4 9 9 10
.000
15

9.372
5
.
6
2
8
Use this site to play MATHFROG ADDING AND SUBTRACTING FRACTIONS
http://cemc2.math.uwaterloo.ca/mathfrog/english/kidz/addsubdec.shtml
Homework Time!
P. 27, 149 odd