250
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The question being: ? + 750 = 1,000 To find "?", you use the opposite operation. Since the question is addition, you will use subtraction to find "?". Take the answer (1,000) and subtract the known number (750) from it. 1,000 - 750 = 250 Thus, ? = 250 The answer is 250.
850
750 - 1000 = -250
1750
1000