23 000. This is standard form and should be written as: 23 x 10^2. (The ^ denotes an exponent.)
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10² × 0.23 = 10 × 10 × 0.23 = 100 × 0.23 = 23 The quick way to do this is to note that the power of 10 is (positive) 2, so move the decimal point 2 places to the right → 10² × 0.23 = 23
6.0 x 1023 equals 600,000,000,000,000,000,000,000
10^-23 = 0.00000000000000000000001
1023
602,000,000,000,000,000,000,000