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I can see what they're trying to do.
The problem is that they're using symbols (written numbers) instead of drawing it on a number line (vectors) or using manipulatives like coins.
Using symbols when introducing this method prompts students to use verbal thinking when they should be using spatial thinking.
Use vectors or manipulatives until they're using spatial thinking, then translate the idea to symbols.
Teaching this takes a bit of individualized attention and is not well suited to mass instruction.
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Waiting for the perfect moment is a fruitless endeavor.
Make a decision, and then make it the right one through your actions.
"Whoever watches the wind will not plant; whoever looks at the clouds will not reap." -Ecclesiastes 11:4 (NIV)
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