Chapter 2 Review

Addition Properties

100

Find the unknown and what property is it?

( __ + 8) + 7 = 9 + (8 + 7) 

9

Associative

200

Find the unknown and what property is it?

__ + 0 = 19

19

Identity

300

Find the unknown and what property is it?

14 + 13 = 13 + ___

14

Commutative

400

Give an example of Commutative Property

______

500

Can any number complete the number sentence? Explain.

(23 + __) + 19 = 23 + (__ + 19) 

Yes! Associative property shows that the same numbers will be on each side. 

Addition and Subtraction Patterns

100

100 less than 37,972

37,872

200

1 less than 37,937

37,936

300

10,000 more than 374

10,374

400

45,311 + _______ = 46,311

1,000

500

84,552 + _______ = 94,552

10,000

Add/Subtract Mentally

100

8,825-6,397

2,428

200

223+728

951

300

684-169

Make a ten

515

400

What is the answer to an ADDITION problem called?

Sum

500

Attendance at a concert was 12,769. The following evening, the attendance was 13,789. How many more people attended the concert on the second night?

1,020 people

Estimate Sums and Differences

100

1,454 + 355

Hundreds

1,500 + 300 =1,800 

200

2,871 + 427

Hundreds

2,900 + 400 =3,300 

300

$27,986 - $4,521

Thousands 

$28,000 - $5,000 =$23,000

400

What is the answer to a SUBTRACTION problem called?

Difference

500

Write two numbers that when rounded to the thousands place have an estimated sum of 10,000. 

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Adding/Subtracting Whole numbers

100

10,345+20,344

130,689

200

340-120

220

300

827,120 + 123,492

950,612

400

349,123 - 252,125

96,998

500

Come up with a problem that has a difference of 53,324

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