1. Number

Is $4$4 rational or irrational?

Rational

A

Irrational

B

Easy

Less than a minute

Is $\frac{2}{3}$23 rational or irrational?

Is $4.435$4.435 rational or irrational?

Is $\sqrt{81}$√81 rational or irrational?

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Describe, compare, and order numbers in the real number system (rational and irrational numbers), separately and in combination, in various contexts.

Estimate and calculate square roots, in various contexts.

Understand and recall commonly used square numbers and their square roots.