20 millionths = 2.0 × 10-5
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23.456 = (2 x 10) + (3 x 1) + (4/10) + (5/100) + (6/1000)
20% = 1⁄5
X = " a number " X + 20
d
Sure thing, honey. 20 million 5 hundred thousand in expanded notation using exponents is 2 x 10^7 + 5 x 10^5. Just break down the numbers and slap those exponents on 'em like it's nobody's business. Easy peasy lemon squeezy.