To Regroup, or not regroup! That is the question!

2-digit Addition

100

53+27=

80

200

48+46=

94

300

77+84=

161

400

85+57=

143

500

89+99=

188

2-digit Subtraction

100

67-22=

45

200

54-32=

22

300

72-45=

27

400

85-27=

58

500

90-67=

23

3-digit Addtion

100

545+142=

687

200

472+36=

508

300

583+218=

801

400

754+296=

1,050

500

865+867=

1,732

3-Digit Subtraction

100

585-24=

561

200

632-473=

159

300

705-546=

159

400

820-434=

386

500

900-586=

314

Do I need to Regroup?

100

Will you need to regroup for this problem?

711+190=

Yes!

Regroup 1 hundred for 10 tens.

200

838-326=

No!

Subtract each place as is.

300

543+544=

No!

Add each place and get a sum.

400

604-278=

Yes!

Regroup 1 ten for 10 ones first, then regroup 1 hundred for 10 tens.

500

1,476+528=

Yes!

Regroup 10 ones into 1 ten, then regroup 10 tens into 1 hundred, then regroup 10 hundreds into 1 thousand.