a) 456.91(3) $\approx$ 456.9; 13.141567890123... $\approx$ 13.1.
b) 6.76(87)$\approx$ 6.769; 987.41485075432...$\approx$ 987.415.
a) 456.91(3) $\approx$ 456.9; 13.141567890123... $\approx$ 13.1.
b) 6.76(87)$\approx$ 6.769; 987.41485075432...$\approx$ 987.415.