# 2.2 Indeterminacy: moving from specific unknowns to variables

When learners are introduced to symbolic representations, they often represent a quantity that has a specific but unknown value. The learner may be asked to find this value.

Two examples of such problems are missing number problems and Think of a Number (THOAN) problems.

## Activity 7 Missing number problems

Have a go at the following problems.

## Activity 8 Reflecting

What makes these *algebra* problems, rather than simply number problems?

What do you expect learners to learn from these problems?

Now watch the two videos that discuss these questions.