Younger students who do not use irrational numbers eg surds like square root of 2 or 3, and only use pi' value as 22/7 or 3.14 when calculating the perimeter or area of a circle find it hard to think about the place of irrational numbers on a number line when they begin to learn about irrational numbers after they learn negative numbers.
This practice activity can be done after initial introduction to irrational numbers, and when students have familiarised with using calculators to find square roots of 2, 3, 5 etc and to find the calculator value of pi and fractional values of pi.
The idea is to let the students practice placing expressions with irrational numbers on a number line so that they have a better number sense of irrational numbers.
