2 × 5 × 5 = 50
For non-Americans, in standard form:
50 = 5 × 10^1.
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The number 2 in standard form is 2.0 × 100
0.054
2.0 × 10-3 written in standard form is 0.0020
2*3*7 = 42 = 4.2*101
A standard numeral is simply a number written in number form - 1, 2, 3, etc.