Show:
Addition Properties
Rounding
Sums
Word Problems
Addition patterns
100

Explain the commutative property.

Changing the order of the addends does not change the sum.
100

Estimate. Round each addend to the indicated place value.

34 + 57; tens

30 + 60 = 90

100

253 + 432 = 

685

100
A car dealership had a sale at the beginning of the week. They sold 87 cars on Monday, 45 on Tuesday, and 78 on Wednesday. Which day did they sell the most cars?

Monday

100

100 more than 3,456

3,556

200

Explain the identity property. 

Any number plus 0 will equal that number.

200

Estimate. Round each addend to the indicated place value.

18 + 7; tens

20 + 10 = 30

200

2,148 + 2,485 = 

4,633

200

We exercised for 42 minutes on Friday, 37 minutes on Saturday, and 24 minutes on Sunday. How many minutes did I exercise in all?

103 minutes

200

1,000 more than 459

1,459

300
Explain the associative property. 
Changing the grouping (parentheses) of the addends does not change the sum.
300

Estimate. Round each addend to the indicated place value.

437 + 250; hundreds

400 + 300 = 700

300

4,598 + 8,123 = 

12,721

300

For my 2 dogs, they each have a leash, 2 dog bones, and 4 dog toys. How many items do I have total?

14 items in all

300

100 more than 1,984

2,084

400

Which number goes in the blank and what property does this show?

____ + 42 = 42 + 23

23; Commutative Property

400

Estimate. Round each addend to the indicated place value.

1,543 + 3,430; thousands

2,000+3,000= 5,000

400

999 + 999 =

1,998

400
Jose had 37 baseball cards, 42 football cards, and 58 Pokemon cards. About how many cards did he have in all?

40 + 40 + 60 = 140 cards (remember that the word about means to estimate and not find the exact answer)

400

10 less than 874

864

500

Fill in the blanks and what property does this show?

(2 + ___) + ____ =  ___ + (14 + 17) 

14; 17; 2; Associative Property

500

Estimate. Round each addend to the indicated place value.

97 + 192; tens

100 + 200 = 300

500

4,559 + 8,990 =

13,549

500

I have $623 dollars in the bank and I have $139 saved up at home. Is it reasonable to say that I have about $900? Explain.

No, since $623 rounds to $600 and $139 rounds to $100, $600 + $100 = $700.

500

1,087 + ____ = 1,097

10