In this 1st grade math lesson, we write FACT FAMILIES using small numbers. A "fact family" consists of two additions and two subtractions that use the same three numbers. It's the same concept as NUMBER BONDS. For example, 2 + 6 = 8, 6 + 2 = 8, 8 - 2 = 6, and 8 - 6 = 2 makes up a fact family (two addition facts plus two subtraction facts).
If you're given just ONE of those facts (either addition or subtraction), you can write the entire fact family, and that is what we practice in the middle part of the lesson.
Lastly, we solve two word problems that involve bicycle and tricycle wheels - DRAWING the problem helps a lot here!
Check out also Math Mammoth Grade 1 curriculum at http://www.mathmammoth.com/complete/grade_1.php
Tagged under: addition,subtraction,fact family,number bonds,addition fact,subtraction fact,1st grade,math,word problems
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