Subtraction Facts: Subtracting from 1, 2 and 3
The goal should be to eventually have the student answer these
facts from memory, although this doesn't typically happen until later
grades. In the meantime, students typically need to calculate
the answer by
counting objects of some type. While addition facts can typically be
answered by counting figures - subtraction facts are answered by writing
and crossing out "tally-marks" - objects of some kind - or by counting up
on one's fingers. Whichever method is used our main goal here is to
insure the student simply understands the concept of subtraction with
small numbers. In other words, do they know that subtraction means
to be "taking-away" something and that the answer will always be smaller.
If too much time is taken in calculating answers, the worksheet should be
give for additional practice.
There are 4 subtraction facts on the screen. Answer them as I point to
them. Use whatever way you would like to get the answer.