Skill 4A
Two Digit Plus One Digit: Horizontal
Adding a twodigit number with a onedigit number horizontally is a very
important skill in being able to properly add 3 numbers vertically.
For example, if your student was adding 25 + 27 + 33 vertically, he/she
would first add 5+7, then take that answer (which is 12) and add 3 on top
of that. The problems below practice this exact process. If
your student is doing this correctly, he/she should be using a "counton"
method (i.e. flying fist) by saying the larger first number and then
counting up by the value of the second number (extending the fingers one
at a time from the fist).
To make this process even easier to
understand (not here, but when teaching it in our worksheet) you could say
 "What is 11 plus 4 fingers?"
Tell me the answer to the addition problems below. I want you to get
the answer to these problems in the easiest and fastest way you
know.
Your student should use some type of "counton" method and not be starting
from 1 (as that would greatly extend the time it takes to get the answer).
The answer really should be achieved in no more than 10 seconds,
otherwise, the skill should be practiced.
