Missing Addends
Identity Property
Associative Property
Commutative Property
Identity Property-The sum of zero and any number is that same number
Associative Property- You can group addends in any way and the sum will be the same
Commutative Property- You can add any number in any order and the sum will be the same
What does difference mean?
Subtraction
23-15=
18
115, 123, 145, 153
All to the nearest 10
110, 120, 140, 150
360-120=240
4+(2+3) = 4+_______
4+(2+3) = 4+5
Carrie invited 13 girls to a party. Five of the girls have already arrived. How many girls have yet to arrive? Show your work.
8 Girls
What is the estimated value of 76-24=?
60
To the nearest 100
On Friday, 537 people attended a play. For Saturday's performance, there were 812 people. About how many more people attended the play on Saturday than on Friday?
270
What property of addition is shown in the number sentence?
___ + 9 = 9
Identity Property
Robyn has 9 CD's
How many more CD's does Terrance have than Robyn? Show your work
5 CD's
Split into 10's and 1's
Split only one number into 10's and 1's
1,203; 1,334; 1,456; 2,675
Round to the nearest 100
1,200; 1,300; 1,400; 2,600
A football team scored 529 points one season and then 376 points the next. About how many points less did the team score in the second season? Round to the nearest ten.
150 Points
What Property is this?
(3+4) +6 = 3+(4+6)
Associative Property
Use compatible numbers to estimate the difference of 67-53= ____. Show your work
70-50= 20
Solve.
32 + n = 41
n=9
12,039; 13,450; 14,552; 23,009
Round to the nearest 1,000
12,000; 13,000; 15,000; 23,000
Waco, Texas has an elevation of 405 feet. Dallas, Texas has an elevation of 463 feet. About how many feet greater is Dalla's elevation than Waco's elevation? Write the number sentence with the answer.
460-410=50