Many math teachers suggest that it is easiest for children to grasp “doubles” (1+1, 2+2, . . .); therefore, it is best to begin memorizing addition starting with the doubles facts (1-12).
Why are doubles easier to learn?
Probably because you only have to memorize 2 numbers instead of three (since 1 of the numbers is the same instead of three different numbers.)
Lesson Ideas ~ http://www.brainpopjr.com/math/additionandsubtraction/doubles/grownups.weml
To First GradersStrategies for Mental Math ~
To add double numbers there are a couple of strategies that might help students.
When you add a double you are counting by that number once.
For example: 4 + 4 = think of 4,8 … counting by fours
Practice skip counting by each number in turn:
4-8 etc. This gets harder with the higher numbers but skip counting is an important skill for students to have.
Doubles occur everywhere in life.
For example: an egg carton is 6 + 6
two hands are 5 + 5
16 pack of crayons has 8 + 8
two weeks 7 + 7 =
legs on an insect (4 on each side) 4 + 4 ~ http://olc.spsd.sk.ca/de/math1-3/p-mentalmath.html
Do a variety of activities with double numbers and have students determine and explain which strategies help them remember. Each student should look at each fact and relate to a visual image or counting by strategy that works for them.
More Mental Math here
Using Music to Teach Doubles
It’s the doubles, baby,
let’s go, let’s go!
It’s the doubles, baby,
and we start with zero:
4+4=8 That’s great!
6+6=12 That’s swell!
7+7=14 Let’s Lean!
8+8=16 Really Keen!
9+9=18 Jelly Bean!
10+10=20 That’s plenty!
Teacher Singing Doubles Song ~ http://www1.teachertube.com/viewVideo.php?title=Doubles_Facts&video_id=8765
Doubles Song (and other songs to teach math)
Doubles are fun, doubles are cool.
We’re havin’ fun, doin’ doubles at school.
Doubles are cool, doubles are fun.
We’re doin’ doubles ’til the school day is done.
A button red
A button blue
Two ducks quack
Two lions roar
Three little kittens
Three little chicks
Four peas on a spoon
Four peas on a plate
Five fingers here
Five fingers again
Six dogs dig
Six dogs delve
Seven faces dirty
Seven faces clean
Eight jackets red
Eight jackets green
Other Useful Links
Teaching Addition and Subtraction Idea Box
Tips to teach addition and subtraction
Strategies to Learn Math Facts ~ PDF
Math Activities for Teaching Doubles
Great Ideas in This Article by Hildra Tague ~ or here
What Your First Grader Needs to Know