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Which fraction can be replaced with 1 half when estimating?

There are infinitely many such fractions and the answer also depends on which other benchmarks you are using.


How is estimating quotients different from estimating products?

Estimating quotients is like trying to guess how many slices of cake you'll get from a whole cake, while estimating products is like trying to figure out how much money you'll have after buying a certain number of cakes. In both cases, you're making an educated guess based on the numbers involved, but the end result is either a quotient (division) or a product (multiplication). So, in a nutshell, estimating quotients involves dividing and estimating products involves multiplying.


How many yards of concrete for 490 square ft patio 5 inches deep?

5 inches is 5/12 feet. So volume of concrete required is 490 x 5/12 = 204.16 cubic feet There are 3 x 3 x 3 = 27 cubic feet in a cubic yard. Therefore the volume required is 204/27 = 7.56 cubic yards (say 8 cubic yards). A useful example of estimating foundations and floor is at `Estimating - Foundation and Floor' http://www.inquirewithin.biz/Vol2/Estimating/estimating_foundations.htm


What fraction can be replaced with 1.2 when estimating?

The answer depends on the accuracy that is required. 1.2 metres instead of 1.21 metres will be OK for most purposes but if you are trying to fit a 1.21 metre object when the space available is 1.2 metres, you are in big trouble!


Why number one is a special number?

The first if the Natural Numbers has many special mathematical, spiritual and philosophical properties. In terms of mathematics, it is the identity element for multiplication, part of the definition of prime numbers. In spirituality, in Christianity, it is both the idea of a single god, and his significance in the religion, with the first commandment. The philosophical properties began with a mathematician named Descartes, inquiring about 'Does One say its own name?". The philosophical question impacts uniqueness in economics, science, philosophy, the Search for Extra Tereserial Intelligence, and Drake's equation estimating it.