require 'bigdecimal'
BigDecimal("10").to_s

BigDecimal("1000").to_s

BigDecimal("1000").to_s("F")

BigDecimal("0.123456789").to_s

nm = "0.123456789012345678901234567890123456789"
nm.to_f

BigDecimal(nm).to_s

BigDecimal("105000").split

BigDecimal("-0.005").split

(BigDecimal("2") / BigDecimal("3")).to_s

2.0/3

def two_thirds(precision)
  (BigDecimal("2", precision) / BigDecimal("3")).to_s  
end
two_thirds(1)

two_thirds(4)

two_thirds(5)

two_thirds(9)

two_thirds(13)

BigDecimal("2").precs

BigDecimal("2.000000000000").precs

BigDecimal("2.000000000001").precs

(a = BigDecimal("2.01")).precs

(b = BigDecimal("3.01")).precs

(product = a * b).to_s("F")

product.precs

two_thirds = (BigDecimal("2", 13) / 3)
two_thirds.to_s

(two_thirds + 1).to_s

two_thirds.add(1, 1).to_s

two_thirds.add(1, 4).to_s

require 'bigdecimal/math'
include BigMath
two = BigDecimal("2")
BigMath::sqrt(two, 10).to_s("F")

BigMath::sqrt(two, 10).round(10).to_s("F")

BigMath::sqrt(two, 28).round(28).to_s("F")

Math::PI

Math::PI.class

BigDecimal.PI(1).to_s

BigDecimal.PI(20).to_s