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| Next is subtraction. Subtraction is the opposite of addition and the bigger number always goes first. | |
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| But, if the smaller number goes first, that would make the difference into a negative number. | |
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| We are at the bottom of the sea, or below sea level, or at the negative part of the number line. Be fore we were at the positive part of the number line,at 9.5*C. Now its -10*C, that's a 100*C change. | |
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