My seven-year-old son likes math, and his math assignments include explaining how you determined the answers to certain problems. A recent problem was to explain how you figure out the answer to 81-16. David said, "Well, what's the answer?" Calvin pauses for just a second and then says, "65." David asks him, "So how did you get that?" Calvin goes, "Well, 1 - 6 = -5, so instead of subtracting 10 from 80, I subtract 20 from 80 and then subtract the -5."
Clear, everyone?
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