Estimation is most useful when it supports a decision: whether there is enough food, time, space, money or material. It should not become an extra calculation attached to every activity.

Put the estimate to work

Choose a real decision and ask for an initial estimate.

For example:

• Is £25 likely to cover four lunches?

• How many storage boxes will fit on a shelf?

• Is 500 g of pasta enough for the group?

• How early should we leave for a journey?

Ask the young person to state a sensible range and what information they used. Let the activity continue, then check and adjust the estimate when better information becomes available.

Make assumptions visible

An estimate depends on assumptions. Four lunches at £5 each is different from four lunches at £8 each. Ask, “What are you assuming?” and “What could change the answer?” This connects quantity judgement with planning.

Encourage independence

Agree that the young person will estimate only where it has a purpose. Step back once they begin checking prices, amounts or timings for themselves. Do not insist on an exact prediction or correct it before the real amount is known.

If estimates remain far from realistic even for familiar quantities, share a concrete example with school. This can help identify whether the difficulty involves units, size, calculation or interpreting the situation.