Nonvertical methods Subtraction

1 nonvertical methods

1.1 counting up
1.2 breaking subtraction
1.3 same change

nonvertical methods
counting up

instead of finding difference digit digit, 1 can count numbers between subtrahend , minuend.

example: 1234 − 567 = can found following steps:

567 + 3 = 570
570 + 30 = 600
600 + 400 = 1000
1000 + 234 = 1234

add value each step total difference: 3 + 30 + 400 + 234 = 667.

breaking subtraction

another method useful mental arithmetic split subtraction small steps.

example: 1234 − 567 = can solved in following way:

1234 − 500 = 734
734 − 60 = 674
674 − 7 = 667

same change

the same change method uses fact adding or subtracting same number minuend , subtrahend not change answer. 1 adds amount needed zeros in subtrahend.

example:

1234 − 567 = can solved follows:

1234 − 567 = 1237 − 570 = 1267 − 600 = 667




^ many ways of arithmetic in ucsmp everyday mathematics subtraction: counting up
^ many ways of arithmetic in ucsmp everyday mathematics subtraction: left right subtraction
^ many ways of arithmetic in ucsmp everyday mathematics subtraction: same change rule