Vocabulary
This property states that the order in which numbers are added does not change the sum
This property states that the order in which numbers are added does not change the sum
Commutative Property
9 + 3 = 3 + 9
9 + 3 = 3 + 9
is the commutative property
435 + 227
435 + 227 = 662
643 rounded to the nearest ten is 600
643 rounded to the nearest ten is 600
FALSE
643 rounded to the nearest ten is 640
Round to the nearest ten
47
Round to the nearest ten
47 rounds to 50
This property states that the way the addends are grouped does not change the sum
This property states that the way the addends are grouped does not change the sum
Associative Property
(3 + 8) + 2 = 3 + (8 + 2)
(3 + 8) + 2 = 3 + (8 + 2)
is the associative property
209 + 290 =
209 + 290 =499
A number close to an exact value is called a sum.
A number close to an exact value is called a sum.
FALSE
A number close to an exact value is called an estimate.
Round to the nearest ten
85
Round to the nearest ten
85 rounds to 90
This property states that the sum of any number and zero is that number
This property states that the sum of any number and zero is that number
Identity Property
9 + 0 = 9
9 + 0 = 9
is the identity property
1,216 + 1,924 =
1,216 + 1,924 =
Lucy says that 569 + 0 is an example of the identity property because 569 + 0 = 569, and adding zero does not change the number.
Lucy says that 569 + 0 is an example of the identity property because 569 + 0 = 569, and adding zero does not change the number.
TRUE
Round to the nearest hundred
173
Round to the nearest hundred
173 rounds to 200
The answer to an addition problem
The answer to an addition problem
Sum
What number goes in the blank?
___ + 6 = 6 + 7
What number goes in the blank?
___ + 6 = 6 + 7
7
Add then estimate to nearest hundred
502 + 329 =
Add then estimate to nearest hundred
502 + 329 = 831
831 rounds to 800
Ben says that for the problem 388 + 385 there would be no regrouping needed.
Ben says that for the problem 388 + 385 there would be no regrouping needed.
FALSE
Regrouping the ones AND the tens place is needed for this problem.
Round to the nearest hundred
851
Round to the nearest hundred
851 rounds to 900
To use place value to exchange equal amounts when renaming a number
To use place value to exchange equal amounts when renaming a number
Regrouping
What number goes in the blank?
(3 + 9) + ____ = 3 + (9 + 1)
What number goes in the blank?
(3 + 9) + ____ = 3 + (9 + 1)
1
Add then estimate to nearest hundred:
3,004 + 253 =
Add then estimate to nearest hundred:
3,004 + 253 = 3,257
3,257 rounds to 3,300
Susan says that grouping addends does not change the sum.
Susan says that grouping addends does not change the sum.
TRUE
Grouping addends is the associative property and it does not change the sum.
Round to the nearest hundred
2,739
Round to the nearest hundred
2,739 rounds to 2,700