Examples:

    Th H T U                                                                                  Th H T U
    3  2  4  5                                                                                   5  6  2  1
  +2  41 51 7                                                                                  3  2  4  6
    5  7  0  2                                                                                +11  31 51 7
                                                                                                   10  2  2  4
 

Work out the Following:

      Th H T U                                                                     Th H T U

1. a) 1 3 4 6                                                                     b) 3 2 4 7
      +2 5 7 9                                                                       +2 6 9 1
 
 

2. a) 3 4 7 5                                                                      b) 2 6 8 5
      +5 2 1 8                                                                        +4 3 4 7
 
 

3. a) 4 3 8 1                                                                      b) 4 7 2 9
        3 7 2 5                                                                          5 3 4 1
      +6 1 4 8                                                                        +7 2 8 5
 
 

4. a) 2 136 + 8 247 + 3 281
    b) 5 356 + 2 893 + 4 290
    c) 4 208 + 3 478 + 2 658
    d) 2 892 + 3 467 + 4 271