If you're asking about entering powers of ten, use the EE (enter exponent) key just above the 7. If you're asking about exponentiation, use the y^x key just above the divide. If you're asking about antilogarithms, use the second shift of the appropriate logarithm key on the top row.
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If you're asking about entering powers of ten, use the EE (enter exponent) key just above the 7. If you're asking about exponentiation, use the y^x key just above the divide. If you're asking about antilogarithms, use the second shift of the appropriate logarithm key on the top row.