VOCABULARY
The order of the numbers in an operation does not change the result.
ex: 2+5 = 5+2
commutative property
Estimate the sum:
7,324 + 10,567 =
18,000
2,345 + 6,709
9,054
The insurance company gave Mrs. Betty a check for $8435. Her car repairs cost $7,367.
How much money did she get back?
$1,068
What is the value of the 8 in this number?
78,556,900
8 million
Any number plus zero is that number
identity property
Estimate the difference
999-623=
400
Add using partial sums
1,462 + 5,007 =
6,469
10,000 - 3,603
A. 7,996
B. 13,603
C. 6,397
C. 6,397
Round 5,987,237 to the nearest million
6,000,000
What does it mean to COMPARE numbers?
<, >, =
The first cruise ship that docked had 1,783 people on board. The second ship had 1,230. About how many people were on both ships?
3,000 people
There are 3,281 maple trees and 3,405 fir trees in a state. That is the total number of trees in the state?
6,686 trees
4,625 - 2,337 =
A. 3,288
B. 2,288
C. 2,312
B, 2,288
Write this number in expanded form.
456,310
400,000 + 50,000 + 6,000 + 300 + 10
When there are three or more numbers in an addition problem, you can change the grouping without changing the result
ex: (4+6) + 2 = 12
4 + (6+2) = 12
associative property
Estimate the sums to the nearest ten thousands.
19,040 + 23,476 =
40,000
43,698 + 8,296 =
51,994
8,036 - 5,821
2,215
Round this number to the nearest ten thousands
864,097
860,000