Vocabulary
What is the word to use for the answer to an addition problem?
Sum
7 + 2 = 9
Basic fact
Estimate
___________________X_____________________
10 20 30 40
22, 23, or 24
22 + 34 =
22 + 34 = 56
Round:
________________________X_________________
100 200 300 400 500
Rounds to 400
The answer to an addition property is written in this form?
Standard form
5 + 3 = 3 + 5
Commutative property of addition
Estimate
_______________________________X___________
30 40 50 60
51 or 52
39 + 17 =
39 + 17 = 56
Round:
_____________________________ X__________
50 60 70 80
Rounds to 80
What is the form when separating a number into hundreds, tens, and ones?
Expanded form
200 + 60 + 5 = 265
Expanded form
Estimate
X________
70 80 90 100
107, 108, or 109
20 + 5 + 50 + 3 =
20 + 5 + 50 + 3 = 78
Round:
________________X_______________________
100 200 300 400
Rounds to 200
What is the name of a line that goes right and left? Or east and west?
Horizontal
2 + 5 = 7
20 + 50 = 70
200 + 500 = 700
Extended Facts
Estimate
______________________________________X____
20 30 40 50
48 or 49
37 + 55 =
37 + 55 = 92
Round:
_________________________________X_______
10,000 20,000 30,000 40,000
Round to 40,000
What is the rule or property in addition that we can move the numbers around when adding and they will equal the same number?
Commutative property of addition
20 + 40 + 3 + 1 = 64
Horizontal Expanded Addition
Estimate
_____________________X_____________________
3,000 4,000 5,000
4,100 or 4,200
40 + 3 + 50 + 7 =
40 + 3 + 50 + 7 = 100
Round:
_______________X________________________
200 210 220 230
Rounds to 210