If your child knows their doubles they can count backwards and forward 1 or 2. Doubles minus/plus 1 or 2are called Neighbors. Once practiced many kids get it..keep practicing!
Your child may need more support when you begin: Use two ten frames to practice adding and subtracting close to doubles. Start with the double equation (5+5-indicated by orange) then add 1: (5+6 (indicated by red)) and add 2: (5+7 (indicated by red and green)). For subtraction you can take away the dots. Start with 5+5 then take away 1 or 2.
3. Memory Tricks:
Check out these Memory tricks:
0 - grape problems: Say, "Eat the grape, write the other number!"
+ 1 - next guy problems: Say, "Write the next guy!" (meaning the next number)
At first you can say the rhymes as your child is doing the problem and later just give a reminder. For example, "What kind of problem is this?"
-Rhymes by Hildra Tague, from Math 101
4. Double's Neighbors
( this game will reinforce the idea of Neighbors)
Anywhere you are you can chant a double and have your child chant it's neighbor. For example, chant 5 + 5 = 10 then, your child responds: WALK-TO-THE-NEIGHBORS 5 + 6= 11.
2nd grade students should be able to answer close to doubles/ neighbors math facts using a strategy that works for them.
3rd Grade students are expected to master these facts. Mastery means they can answer in 3 seconds or less and be accurate.