Standard Algorithm
The standard or typical method of
adding and subtracting using pencil and
Number Bonds
paper. Students learn to add and
subtract using unit form before
learning the standard algorithm.
It is very important for students to have memorized the basic facts that equal 10.
Once students can recall them quickly you can add in groups of ten. Flashcards
work really well for developing a fluency with addition and subtraction facts.
20
10
7
3
Decompose to Add
17
3
Arrow Method
Breaking apart
The arrow method allows us to add and subtract mentally by breaking apart a
an addend to
number into unit form. Practice counting up and down by tens and ones to support
make a ten can
this method.
help us add in
our minds.