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But irrational constants such as π and √2—numbers that cannot be reduced to a simple fraction—frequently crop up in science and engineering.

They both mistakenly treat DNA as a matter of simple fractions.

In maths, they must be are able to multiply and divide whole numbers and use simple fractions and percentages, among other things.

In maths, they are able to multiply and divide whole numbers by 10 or 100 and use simple fractions and percentages, among other things.

One example is Andrew Short’s one-person company in Bellevue, Wash., Jungle Education, which creates educational apps for the iPad that help children learn basics like telling time, simple fractions, coin math and geometry.