70 in scientific notation is 7 x 101 (might show up as 7E1 on some calculators).
Watch out for significant figures and avoid 7.0 x 101 as the zero is not a sig fig in this case since there is no decimal.
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70 = 7.0 × 101
2000+400+70+8
If you mean 70,000 then it is 7.0*10^4 in scientific notation
7.0 X 10^7
It is 8.9*10^-5 in scientific notation