addition
Subtraction
Harder addition
Harder subtraction
Challenge
100

127+238

365

100

1009-857

152

100

3,579+8,214

11,593

100

12,582-5,383

7,199

100

157,395+279,381

436,776

200

257+295

552

200

2,589-725

1,864

200

7,329+ 5,575

12,404

200

14,305-8,476

5,824

200

394,792+217,123

611,915

300

575+817

1,392

300

3,876-1,983

1,893

300

9,385+7,276

16,661

300

21,571-15,385

6,186

300

579,381+482,592

1,061,973

400

835+758

1,593

400

5,983-3,826

2,157

400

15,728+3,682

19,410

400

35,295-29,493

5,802

400

734,123-417,154

316,969

500

1,259+1,387

2,646

500

7,863-4,995

2,848

500

21,345+58,297

79,642

500

51,712-38,957

12,755

500

1,057,795-375,493

682,302

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