MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
With any addition or subtraction problem, we simplify by moving from left to right. One organizational strategy is to draw a little arrow down between the two values that you're combining, and do one step per line on your lined paper. Although these arrows might feel tedious, they will help with organization and help you break a long string of adding and subtracting into smaller, more manageable steps.
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