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For 2 number x1 and x2:
x1 = a1 × 10b1
x2 = a2 × 10b2
x1 + x2 = a1 × 10b1 + a2 × 10b2
x1 - x2 = a1 × 10b1 - a2 × 10b2
x1 × x2 = a1a2 × 10b1+b2
x1 / x2 = (a1/a2) × 10b1-b2