4.2*10-4 IS in standard form.
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2.3 x 104
6.4 x 104
42 million written in standard form is 42,000,000. In standard form, numbers are expressed in terms of powers of 10. The number 42 million can be written as 42 x 1,000,000, where 1,000,000 is 10^6. Therefore, 42 million in standard form is 42 x 10^6, which is equivalent to 42,000,000.
8.9 times 10 power 4 in standard form is: 8.9 x 1048.9 x 104 in standard notation is: 89,000
20,000 in standard form is 2.0 × 104