1

1

28

12

19

21

1

422815 33

1

42

42

2815

15

42 + 15 = 57

33

1

16

1

1

21

12

1

1

3 × 10 + 4 × 5 + 2 × 1 = 52

1 × 10 + 3 × 5 + 2 × 1

1

+ - ×

0 1 2 3

×

-

+ = 8

= 1

3

3

22

2

1

+ - ×

0 1 2 3

×

-

+ = 8

= 1

3

3

22

2

0 + 0 = 0 2 + 3 = 5

0 + 1 =1 3 × 2 = 6

3 - 1 = 2 3 × 2 + 1 = 7

3 × 1 = 3 2 × 2 + 3 + 1 = 8

2 × 2 = 4 3 × 3 = 9