ADDITION AND SUBTRACTION (SHORT-CUT METHODS)

ADDITION AND SUBTRACTION (SHORT-CUT METHODS):

The method is best illustrated with the help of following example:
Illustration 2 54321 – (9876+8976+7689) = ?

Step 1 Add 1st column:

                                                          54321
                                                            9876
                                                            8967
                                                            7689
                                                          27789

6+7+9 = 22
To obtain 1 at unit’s place add 9 to make 31. In the answer, write 9 at unit’s place and carry over 3.

Step 2 Add 2nd column:
3+7+6+8=24
To obtain 2 at tens place add 8 to make 32. In the answer, write 8 at ten’s place and carry over 3.

Step 3 Add 3rd column:
3 + 8 + 9 + 6 = 26
To obtain 3 at hundred’s place, add 7 to make 33. In the answer, write 7 at hundred’s place and carry over 3.

Step 4 Add 4th column:
3 + 9 + 8 + 7 = 27
To obtain 4 at thousand’s place add 7 to make 34. In the answer, write 7 at thousand’s place and over 3
.
Step 5 5th column:
To obtain 5 at ten-thousand’s place add 2 to it to make 5. In the answer, write 2 at the ten-thousand’s place.
\ 54321 – (9876 + 8967 + 7689) = 27789.