Addition Properties and Addition Patterns
What property says 0 + 456 = 456? Why?
Identity Property because any number plus 0 stays the same.
Use front end estimation to estimate the sum
299 + 545
700
Solve using partial sums
111 + 222
100 + 200 = 300
10 + 20 = 30
1 + 2 = 3
Align and Add
233 + 456 + 115
804
Michael has 310 Dojo points. Laine has 313 Dojo points. How many Dojo points do they have in all?
623
What property says that 8 + 2 = 2 + 8? Why?
Commutative Property because the order changes.
Estimate the sum by rounding to the nearest ten.
411 + 365
410 + 370 = 780
Solve using partial sums.
310 + 519
300 + 500 = 800
10 + 10 = 20
0 + 9 = 9
Align and Add
746 + 144 + 110
999
Estella wants to count how much money she has. She got $35 on Monday, $72 on Tuesday, and $100 on Wednesday. How much does she have total?
$207
What property says that 5 + (7 + 3) = (5 + 7) + 3? Why?
Associative Property because the grouping of the parentheses changes.
Estimate the sum by rounding to the nearest hundred.
89 + 785
100 + 800 = 900
Solve using partial sums.
655 + 313
600 + 300 = 900
50 + 10 = 60
5 + 3 = 8
Align and Add
300 + 443 + 178
921
Mr. Vowels and Max were playing a basketball game. In the first half, Mr. Vowels scored 10 points and Max scored 8 points. In the second half, Mr. Vowels scored 8 points and Max scored 10 points. Which addition property is shown?
Commutative Property
10 + 8 = 8 + 10
2 + even = ?
10 + odd = ?
even
odd
Estimate the sum by rounding to the nearest ten and nearest hundred.
433 + 68
430 + 70 = 500
400 + 100 = 500
Align and Add
85 + 580 + 35
700
Diamond Sword = 218 emeralds
Iron Sword = 152 emeralds
Gold Sword = 113 emeralds
Annabelle has 500 emeralds. Does she have enough emeralds to get all three swords?
Yes because the 3 swords cost 483 emeralds and she has 500, which is greater than 483.
List all of the even digits, then list all of the odd digits.
0, 2, 4, 6, 8
1, 3, 5, 7, 9
Estimate the sum by rounding to the nearest ten and nearest hundred.
742 + 211
740 + 210 = 950
700 + 200 = 900
Align and Add
139 + 167 + 200 + 305
811
On Friday night, 138 people went to the St. Joseph soccer game. On Saturday, 266 more people went than on Friday.
How many people went to the gallery in all?
542 people went in all.