Penjumlahan Bilangan

Front

2

Back

1 + 1

Front

3

Back

1 + 2

Front

4

Back

1 + 3

Front

5

Back

1 + 4

Front

6

Back

1 + 5

Front

7

Back

1 + 6

Front

8

Back

1 + 7

Front

9

Back

1 + 8

Front

3

Back

2 + 1

Front

4

Back

2 + 2