Addition 107
What is the easy way to add 9? Add 10 and subtract 1.
What is the easy way to add 8? Add 10 and subtract 2.
What is the easy way to add 7? Add 10 and subtract 3.
What is the easy way to add 95? Add 100 and subtract 5.
What is the easy way to add 85? Add 100 and subtract 15.
What is the easy way to add 80? Add 100 and subtract 20.
What is the easy way to add 48? Add 50 and subtract 2.
Test you rself
Try the following to see how easy this is. Call out the
answers as fast as you can.
24 + 10 =
38 + 10 =
83 + 10 =
67 + 10 =
It is easy to add 10 to any number. I’m sure I don’t need to
give you the answers to these.
Now, try the following problems in your head. Call out the answers
as quickly as you can. Try to say the answer in one step. For example,
for 34 + 9, you wouldn’t call out, “Forty-four... forty-three”; you
would make the adjustment while you call out the answer. You
would just say, “Forty-three.” Try them. As long as you remember
to add 9 by adding 10 and taking 1, add 8 by adding 10 and
taking 2, and add 7 by adding 10 and taking 3, you will fi nd
them easy.
brent
(Brent)
#1