"Half a trillion" or 500 billion would be written exponentially 5 x 10^11 (5 times 10 to the 11th power).
On the US "short scale" the value 1 trillion is 1,000,000,000,000 and the scientific notation is 1 x 10^12.
(10 to the twelfth power)
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There are probably about half a dozen ways to write this number in scientific notation, but one way to write it, in scientific notation, is 2.4936061x108.
8.5 in Scientific Notation = 8.5 x 100
4,500,000,000,000
500,000,000,000,000
It is in scientific notation 1.5 × 10¹² = 1,500,000,000,000-----------------------------------------------------------Tri-llion implies three-fold million; the actual value depends which scale you use:In countries that use the long scale (based on powers of a million) like Europe:1.5 trillion = 1.5 × (1,000,000)³ = 1.5 × (10⁶)³ = 1.5 × 10¹⁸ In countries that use the short scale (based on powers of a thousand plus one) like USA:1.5 trillion = 1.5 × (1,000)⁽³⁺¹⁾ = 1.5 × (10³)⁴ = 1.5 × 10¹²