Using number lines to allow children to "hop" along the line is another way to practice addition by counting on. These 2 worksheets include a simple number line for the children to use as they solve the addition problems given.
Addition to 20 Using Number Lines
This fun poster (which comes as pictured and with 2 fill-in-the-blanks versions) can be put on display or laminated to be kept as a reference. Understanding and learning the "teen facts" makes everything that comes later easier!