Show:
Addition Properties
Add Mentally
Estimate Sums
3 digit Addition
4 Digit Addition
100

0+5=5

Identity

100

20+33=

53

100

101+225

300, 400, etc.

100

100+400=

500

100

1,111 + 2,222

3,333

200

6+4=10

4+6=10

Commutative 

200

79+21=

80+20=100

200

467+933

1,400 , 1,300 , 1,500, ect.

200

470+217=

687

200

5,000 + 4,748

9,748

300

(3+4)+5= 12

3+(4+5)= 12

Associative

300

45+82=

47+80=120

300

2748+3034

6,000 , 5,000 , 4,000 , ect.

300

636+196=

832

300

3,953 + 5,375

9,328

400

Write an example of the commutative property

Example:

5+2=7

2+5=7

400

337+25=

340+22=362

400

5563+2748

9,000 , 10,000 , 8,000

400

782+268

1,030

400

3,452+2,984

6,436

500

Write an example of the Associative Property

Example:

(3+5)+1=9

3+(5+1)=9

500

578+264=

680+262=942

500

8374+4572

13,000 , 12,000 , 11,000 , ect.

500

836+739=

1,575

500

4,789 + 9,974

14,763