Addition Properties
Name of the three addition properties:
Commutative (order), Associative (grouping), Identity (zero)?
37 rounded to the nearest 10.
40
Estimate the sum of 28+46.
80
Give the estimate and the sum of 77 + 52.
130, 129
Balanced
24 + 0 = 24 is an example of _______________ property.
Identity (Zero) Property?
Round to the nearest 10 - 654
650
Estimate the sum of 114 + 58, to the nearest hundred.
200
Draw place value blocks for the number sentence, then give the sum: 635+222.
857. Should have drawn 6 hundreds, 3 tens, 5 ones and 2 hundreds, 2 tens, 2 ones.
This is the name of Mrs. Cordes's oldest son.
Kai
(3+4) + 5 = 12 and 3 + (4+5) = 12 is an example of ____________ property?
Associative (grouping) property?
Round to the nearest hundred: 557.
600
Round to the nearest hundred to estimate the sum 539 + 399.
900
What is the sum of 564+283?
847
Three questions to ask when giving yourself a comprehension check are:
Who is in this part? What is happening? Is it new or does it fit with something that has already happened?
Write an example of the Commutative (Order) property.
Something like 7+5=5+7.
This is a number that rounds to 200 when it is rounded to the nearest hundred.
Any number between 150 and 249
Hernan has 138 marbles. Pia has 132 marbles. Which number sentence is best to estimate how many marbles they have in all? Why?
A. 38+32 = 70
B. 100 + 100 = 200
C. 108+102 = 210
D. 140 + 130 = 270
D because rounding to the nearest 10 gives you numbers that are closer to the actual numbers.
Find the sum of 602+125+231.
958
What number that will make the following sentence true: 2,185 > 2__85
2,3,4,5,6,7,8,9
A lion fish has 13 spines on its back, 2 near the middle of its underside and 3 on its underside near its tail. Write two different number sentences to find how many spines a lion fish has in all. What property did you use?
Example: (13 + 2) +3 =18, (2 +3) + 13=18 used Associative
13+3+2=18, 3+13+2=18 used Commutative.
A 3-digit number has the digits 2,5, and 7. To the nearest hundred, it rounds to 800. What is the number?
752
Regina has 325 Pokemon cards and 272 Minecraft cards. She said she has 597 cards in all. Is this answer reasonable? Use estimating to explain.
Yes it is reasonable because if we round to the nearest ten 325 is 330, and 272 is 270, and 330+270=600. Since 597 is close to 600, her answer is reasonable.
Josefina said that 95+76+86 is greater than 300. Explain why her answer is not reasonable.
Each addend is less than 100, so the sum must be less than 300.
What country was Mrs. Cordes born in? (Or Mr. Hillman, or Mrs. Lesage)
Mrs. Cordes: Canada