Vocabulary
The order in which two numbers are added does not change the sum
Commutative Property of Addition
35 - ____=35
0
Write each number.
10,000 more than 25,953
35,953
Estimate. Round each number to the given place value.
1,454 + 335; hundreds
1,800
The grouping of the addends does not change the sum
Associative Property of Addition
(16+5) + ____= 16 + (5+10)
10
Write each number.
1,000 less than 63,035
62,035
Estimate. Round each number to the given place value.
2,871 + 427; hundreds
3,300
For any number, zero plus that number is the number
Identity Property of Addition
83 + 35 = 35 + ____
83
Write each number.
1,000 less than 49,737
48,737
Estimate. Round each number to the given place value.
$5,238 + $3,420; hundreds
$8,600
A symbol, usually a letter, that is used to represent an unknown quantity
variable
76 + 0 =
76
100,000 more than 53,502
153,502
Estimate. Round each number to the given place value.
48,344 - 7,263; thousands
41,000
A sentence that contains an equal sign (=), showing that two expressions are equal
Equation
54 + (2 + 67) = (54 + ___) + 67
2
100 less than 1,087
987
Estimate. Round each number to the given place value.
27,629 - 5,364; thousands
23,000