Multiplication
Factors
Addition
Subtraction
100

5x3

15

100

Factors of 5

1,5

100

420 + 360

980

100

3,896 - 2, 984

912

200

9x7

63

200

Factors of 6

1, 2, 3, 6

200

653 + 986

639

200

9,102 - 6,340

2,762

300

5x20

100

300

Factors of 9

1,3,9

300

666 + 762

1428

300

763 - 499

264

400

80x40

3200

400

Factors of 21

1, 3, 7, 21

400

45 + 987

1032

400

8,475 - 609

7,866

500

90x200

18000

500

Factors of 18

1, 2, 3, 6, ,9,18

500

3908 + 4566

8474

500

7,341 - 5,180

2,161