### Why do this
problem?

This problem is a short challenge that may introduce pupils to
the idea of square numbers and square roots. It can also be opened
up in all sorts of ways (see the 'Possible extension' section
below).

### Possible approach

You may want to give learners this challenge as you are taking
the register, for example, as it does not need much
explanation.

Sharing ways of approaching the solution will be valuable,
however, as children are likely to have done different things. Some
might have used trial and improvement, some may have used a
calculator to find the square root.

### Key questions

Perhaps you could try two consecutive numbers and see how
close you are?

Do you have sense of how big the numbers will be?

### Possible extension

This problem can be extended in all sorts of ways by asking
'what if ...?' questions.

This sheet gives you some
suggestions.

### Possible support

A calculator is likely to be useful.