BALTIMORE COUNTY PUBLIC SCHOOLS
Addition and Subtraction
Triangle Flashcards
Use the attached triangular flashcards to practice both addition and subtraction facts.
EXAMPLE:
To practice addition, place your thumb over the underlined number on the triangle and hold the card for your child to see. Your child should tell you the sum (answer) of the remaining numbers at the base of the triangle. In our example, you would cover the 13. Your child would say, “Six plus seven equals thirteen” or “seven plus six equals thirteen.”
To practice subtraction, place your thumb over one of the numbers at the base of the triangle and hold the card for your child to see. Let your child tell you a subtraction fact using the remaining two numbers. Then have your child give you the difference (answer). In our example, you could cover the 6. Your child would say, “Thirteen minus seven equals six.”
Department of Professional Development Addition Subtraction Flashcards_20090722
Parent Support Services PSS\Outreach Docs\Content Areas\Math
12/6/2010 VSC Mathematics 6.0
BALTIMORE COUNTY PUBLIC SCHOOLS
Addition and Subtraction
Triangle Flashcards
Department of Professional Development Addition Subtraction Flashcards_20090722
Parent Support Services PSS\Outreach Docs\Content Areas\Math
VSC Mathematics 6.0
12/6/2010 Page 2