Adding and Subtracting Decimals. Lesson 1-5. 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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Commutative Property of Addition: Numbers can be added in any order.
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
This can estimate to 30 + 13, which is 43. (Compatible numbers)
The answer is close to the estimate.
4 9 9 10
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