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7.0*10^-3 - 8.0*10^-4 = 70*10^-4 - 8.0*10^-4 = 62*10^-4 = 6.2*10^-3.

Since the original numbers has 1 sig fig, he rounded answer is 6.0*10^-3.

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Q: How do you calculate 7.0x10-3 minus 8.0x10-4 in scientific notation and significant figures?
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