Two Digit Plus One Digit: Horizontal
Adding a two-digit number with a one-digit 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 "count-on"
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
Your student should use some type of "count-on" 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.