Show:
Addition without regrouping
Addition with regrouping
Subtraction without regrouping
Subtraction with regrouping
100

321+142

468

100

368+427

795

100

845-312

533

100

642-158

484

200

254+123

377

200

527+336

863

200

762-431

331
200

853-464

389

300

413+125

538

300

245+171

416

300

954-623

331

300

742-353

389

400

612+135

747

400

659+273

932

400

681-452

229

400

731-458

273

500

341+254

595

500

384+597

981

500

794-361

433

500

602-374

228