Write each place value from the word form as digits, then combine.<br><br>
&bull; Thousands: Forty-three thousand = 43 × 1 000 = 43000<br>
&bull; Hundreds: six hundred = 600<br>
&bull; Tens and ones: twelve = 12<br>
&bull; Combine: 43000 + 600 + 12 = 43612<br>
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Final Answer: 43612