Vocabulary
Define: Commutative Property of Addition
The order in which numbers are added does not change the sum.
4.67 + 1.70
6.37
Round then add
32.9 + 17.2
50
This property always has parenthesis
Associative Property of Addition
Round 13.3 to the nearest one.
13
Identity Property
The sum of any number and 0 equals the number.
25.39 + 18.68
44.07
Round then subtract
48.21 - 12.64
35
What property is being used?
6 + 0 = 6
Identity
Round 14.56 to the nearest one.
15
Associative Property of Addition
The way in which numbers are grouped does not change the sum.
68.9 + 7.1
76
Round then add
7.91 + 21.9
30
What property is being used?
23 + 3 + 7 = 3 + 23 + 7
Commutative
Round 12.324 to the nearest hundredth.
12.32
What are the three decimal places in order starting right after the decimal?
Tenths, Hundredth, Thousandths
3.15 + 1.2
4.35
What property is being used?
12 + 8 + 13 + 7 = (12+8) + (13+7)
Associative
Round 0.089 to the nearest tenth.
0.1
Define the word Sum
The answer to an addition problem
0.7 + 0.33
1.03
Francis earned the following scores on his math quizzes: 86, 84, 90. Jillian earned the following scores on her math quizzes: 84, 90, 86. Who earned the greater total score?
What addition property would be helpful when finding the answer.
The commutative property
Round 9.999 to the nearest hundredth.
10