Show:
Properties
Estimating Sums
Regrouping
Word Problems
Vocabulary
100
36+0=? What property does this show?
?= 36 This shows the Identity property.
100
Estimate the sum. Round the sum to the nearest ten. 43+ 58= ?
?= 100 40+60=100
100
327+687=
327+ 687=1, 014 300+ 20+7 600+ 80+7 _________________ 900+100+14
100
The ice cream shop is trying to decide which flavor is most popular. This week they sold 78 strawberry scoops, 87 chocolate scoops, and 47 vanilla scoops. Which flavor is the most popular?
Chocolate scoops are the most popular. 87>78>47
100
What is a number close to the exact number?
Estimate
200
8+(2+3)= ? (8+2)+3=? What property explains why these two equations equal the same sum?
?= 13 The associative property shows this.
200
Estimate the sum. Round to the indicated place value. 12+9=?, tens
12+9=? ?= 20
200
2, 467 + 3, 623 ___________
2, 467 + 3, 623 ___________ 6,090
200
In August, Carson managed to save $73 of his $100. In September, he saved $15. How much money did he save over the two months?
73+ 15= 88 70+3 10+5 He saved $88 in two months.
200
This property says that the way addends are grouped does not change the sum.
Associative Property of Addition
300
9+4=4+9 Why are these two equations equal?
They are equal because of the commutative property. The commutative property explains that the sum is the same no matter which order the addends are in.
300
327 + 174; hundreds
500 300+200= 500
300
1, 546+ 2, 436 = L L=? Check your work with another strategy.
L= 3,982 Estimation, expanded form, regrouping, drawing place value blocks 1,000+500+40+6 2,000+400+30+6 ________________
300
Raina walked her dog for 52 minutes on Thursday, 46 minutes on Saturday, and 36 minutes on Sunday. About how many minutes did Raina walk her dog?
50+ 50+ 40= 140 Raina walks her dog for about 140 minutes.
300
This property says that the sum of any number and zero is the same number.
The Identity property
400
7+(4+5) = (4+7) + Q Q= ? Identify the addition property.
Q= 5 Associative property
400
435+687=?, hundreds
400+700= 1, 100
400
3, 468+ 1, 781= ? What are two strategies you could use to solve this problem?
?= 5, 249 Answers vary; drawing models, regrouping, expanded form
400
Marcia takes riding lessons at a stable with 2 horses. Each horse needs a saddle, 2 feeding bags, and 4 horseshoes. How many items are needed for all of the horses?
(1+2+4) + (1+2+4) =14 14 items are needed for the two horses.
400
There are two parts of an addition equation. What are the two parts called?
Addends and sums
500
Does the commutative property work with subtraction? Why or why not?
Answers vary.
500
The grocery store sold 615 containers of Hershey bars for and 459 containers of Kit Kats. About how many containers of chocolate did they sell altogether?
600+500=1,100 They sold around 1,100 containers altogether.
500
3,459 + _____ = 3, 469 What is the unknown? Why?
The unknown is 1000.
500
Aaron has $2,301 in his bank account on Monday. On Tuesday, $5,194 is added to his account. Is it reasonable to say that there is now about $6,000 in his account? Explain.
No it is not reasonable. If you estimate each addend, the estimate to the nearest thousand is 2,000+5,000=7,000
500
What word means to rename a number using place value?
Regrouping