Pretty Properties
The general name for rules we use in addition (Hint: check out the category title)
Addition Properties
Rounding in math means:
A) Finding about how much
B) Rolling clay into a ball
C) Adding numbers together
A) Finding about how much
When you estimate you find:
A) an exact answer
B) about how much
C) the hidden treasure
B) about how much
Use the break apart strategy to solve
43+15
58
3+0=3
This is an example of which property?
A) Commutative
B) Associative
C) Identity
C) Identity
Round this number to the nearest 10.
27
30
Estimate the sum by rounding each number to the nearest 10.
76+12
80+10=90
Use the break apart strategy to solve
66+25
91
7+6=6+7
This is an example of which property?
A) Commutative
B) Associative
C) Identity
A) Commutative
Round this number to the nearest 100.
246
200
Estimate the sum by rounding each addend to the nearest 100.
152+483
200+500=700
Use the picture proof strategy to solve
37+49
86
(2+7)+8=2+(7+8)
This is an example of which property?
Associative
Round this number to the nearest 10.
783
780
Ms. Blom baked 3 dozen cookies for her math students. Estimate how many cookies she baked by rounding your answer to the nearest 10.
40
Use the picture proof strategy to solve
68+77
145
Solve this addition problem using the associative property:
4+(15+9)+(7+3)=10+?
28
Round this number to the nearest 100.
1,562
1,600
There are 18 students in scuba diving lessons. Estimate how many flippers the instructors will need to teach the class. Round your answer to the nearest 10.
40
Use the picture proof strategy to solve
146+98
244