Subtraction 117
Th e easiest way to solve a problem is also the fastest,
with the least chance of making a mistake.
So, what is the easy way to subtract 9? Subtract 10 and add (give
back) 1.
What is the easy way to subtract 8? Subtract 10 and add (give
back) 2.
What is the easy way to subtract 7? Subtract 10 and add (give
back) 3.
What is the easy way to subtract 6? Subtract 10 and add (give
back) 4.
What is the easy way to subtract 90? Subtract 100 and add (give
back) 10.
What is the easy way to subtract 80? Subtract 100 and add (give
back) 20.
What is the easy way to subtract 70? Subtract 100 and add (give
back) 30.
What is the easy way to subtract 95? Subtract 100 and add (give
back) 5.
What is the easy way to subtract 85? Subtract 100 and add (give
back) 15.
What is the easy way to subtract 75? Subtract 100 and add (give
back) 25.
What is the easy way to subtract 68? Subtract 70 and add (give
back) 2.
Do you get the idea? Th e simple way to subtract is to round off and
then adjust.
brent
(Brent)
#1