To subtract one number from another, like -2 – (-4), model the minuend (the first number) using two negative unit tiles. The subtrahend (the second number) tells how much to remove. Since there are not enough negative unit tiles to remove, add two zero pairs. After removing 4 negative tiles there are 2 positive tiles remaining, so -2 – (-4) equals 2.
Subtracting Integers using the Brainingcamp Algebra Tiles virtual manipulative.
Brainingcamp virtual manipulatives can be used anywhere with no setup, cleanup, or lost parts. They are highly effective at engaging today’s digital learners and helping them bringing abstract math concepts to life.
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