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PrivateEyes PrivateEyes is online now
 
Joined: Oct 2005
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PrivateEyes
 
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Joined: Oct 2005
Posts: 4,293
Senior Member
I bet they're struggling
Old 09-27-2019, 10:09 AM
 
Clip to ScrapBook #3

with the concept of subtracting to add. That is, they're not applying/understanding the fact family idea that if 6 + ___ = 20, then 20 - 6 = ___.


I would do it both ways (one is a check on the other) and have them get double practice, plus learn the application of fact families.


So first, count UP.

Start at 6, then up until you get to 20.
First, one at a time
Then, as mentioned previously 6 +4=10, 10+10=20

If the problem was 6 + __ = 22, then you'd do all of the above plus add a step at the end.

6 +4 = 10 10 +10 = 20 20 +2=22 (add 4+10+2 to get the answer 16)

Do the reverse. Start with 20.
Count down by ones.
Then group to make "easy" numbers.
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