Faster
Subtraction:
Similar, to the Addition here also rounding off the nearest 10 is the Mantra.
These tables contain
more information to help you with subtraction
by rounding.
The first table
shows methods and examples for subtracting a number between 11 and 14
from another number.
This table shows methods and examples for
subtracting a number between 15 and 19 from another number:
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