What property? Commutative or Associative
6 + 7 = 7 + 6
Commutative
100
Estimate the sum:Show the equation you would use.
93 + 54 = ________
90 + 50 = 140
100
The answer in addition is called the ________.
sum
100
What's the rule for this pattern?
16, 20, 24, 28
Add 4
200
138 +56
194
200
Is this Associative property used correctly here?
8 + ( 9 + 6) = 8 + ( 6 + 9 )
No
200
Is this answer reasonable? Why or why not?
125 + 238 = 500
No, 100 + 200 = 300, not 500
200
The numbers you add are called the ______________.
Addends
200
3,000 + 50 + 6 = ____________
3,056
300
987 + 1,201 =
2188
300
Explain how you should solve this problem, then solve it.
(19 + 11) + 8 =
Add the parenthesis first, then add the 8. The answer is 38.
300
Joey was trying to figure out how many people would come to his piano concert. He knew there were 39 seats on one side of the room and 128 seats on on the other side. He estimated that no more than 150 people could fit in the room. Is he correct? How do you know?
No, he is not correct because 39 rounds to 40 and 128 rounds to 130. 130 + 40 = 170.
300
What is the name of this property?
45 + 6 = 6 + 45
Commutative Property
300
Scott says the only way to get an even sum is to add two even numbers. Is he correct? Prove your answer.
He is not correct because two odd numbers equal an even sum.
400
538 + 219 + 67 =
824
400
Sara wants to sue the associative property to find the sum of these numbers. She wants to make sure she finds a 0 to add with. How should she group her numbers? Show the equation, then solve it.
45 + 18 + 15
( 45 + 15) + 18 = 78
400
Bobby rounded to find a sum of two numbers. He got 600 when he did this. Which two numbers could deb Bobby's ?
a. 146 + 426
b. 319 + 358
c. 291 + 302
d. 350 + 250
C
400
What is the name of all four-sided shapes that have 2 sets of parallel sides?
parallelogram
400
Solve this mentally.
198 + 256 then explain the mental math strategy you used.
Sum is 454
500
587 + 19 + _____ = 768
162
500
56 + ( ____ + 19 ) = 87
12
500
Three students were comparing how many times they each jumped on a trampoline.
Jorge jumped 345 times.
Keisha jumped 356 times.
LeVar jumped more times than Jorge and fewer times than Keisha.
When each student’s total was rounded to the nearest hundred, Jorge’s total and LeVar’s total were the same.
Which value could be the number of times LeVar jumped on the trampoline?
500
I am a four sided shape. I have all parallel and equal sides. My angles are right angles. I have five names to describe me. What are the five names?
square, rhombus, parallelogram, quadrilateral, and polygon
500
Felicia was working with a special machine that did what ever math operation she asked it when she put a number in the machine. Felicia put 788 in the machine. The machine gave her back the number 1275. What did Felicia ask the machine to do to her number? ( give the operation and the number)