To see examples of sample workbook pages that introduce math facts using
the 2 Ladder strategy visit:
https://www.longevitypublishing.com/sample.pdf

IMPORTANT: Before asking children to memorize answers to math facts, be sure that they can demonstrate what the math fact means.

Once children can count by 2s to at least ten, teach them these addition facts:

2+4, 4+2, 6+2, 6+2, 2+8, 8+2

Tell them to think of going up a ladder with two feet. 2, 4, 6, 8, 10.
Draw a ladder and show the numbers going up by 2’s.

Ask: What comes after the 2 when counting by 2’s? 2+2 = 4
What comes after the 4 when counting by 2’s? 4+2 = 6
What comes after the 6 when counting by 2’s? 6+2 = 8
What comes after the 8 when counting by 2’s? 8+2 = 10
Let them discover that a number +2 is the same answer as 2+ a number.
(2+4, 2+6, 2+8)

Once the children are comfortable with these math facts, have them learn to count backwards by 2’s from 10.
10, 8, 6, 4, 2, 0
This will allow them to learn the related subtraction facts.
To teach 10-2, ask what comes under the 10 when counting down by 2’s on the 2 ladder.
For 8-2: What comes under the 8 when counting down by 2’s
For 6-2: What comes under the 6 when counting down by 2’s
For 4-2: What comes under the 8 when counting down by 2’s

View sample pages from Two Plus Two Is Not Ten: Easy Methods to Learn Addition and Subtraction.