# Day 48: Does this account fit?

## Useful outcome

Make a corrected, checkable quantity note. Use existing safe pieces, original marks or the [empty own organiser](../aids/own-parts.svg). [Full description](../aids/own-parts-alternative.md). The child may keep the product private.

## Prepare and check entry

Prepare the ordinary whole 36 and separate counted/waiting space, two or three parts as relevant, large numeral cards and optional verified ten-strips. Audit a ten before using it. Ask for one-to-one coverage and value of a full unit. Teach missing entry knowledge on a new small collection before today's larger example. Smaller actual quantities remain useful and are named.

## Run the 25-minute component

1. **Start, 3 minutes:** offer the useful outcome. Ask what amount is being organised and how we can include each object once.
2. **Model, 5 minutes:** 30 + 6 = 36. Another account is 20 + 16 = 36. These describe one original collection. Verify each part and include each object once. Compare thirty and six with twenty and sixteen. Both account for thirty-six. Test the faulty claim thirty and five for that stated whole. Find the missing one. Keep a valid account or repair the label/model. Say what your change fixed.
3. **Try together, 7 minutes:** the child selects boundaries/members; an adult may move marks at their direction. Ask “What is in each part? What stayed the same?” Check by the actual members, not only matching printed numerals.
4. **Choose, 7 minutes:** take one of [Card pieces](../choices/day-48-route-1.md), [Drawing tags](../choices/day-48-route-2.md), [Board-game marks](../choices/day-48-route-3.md). Different purposes/quantities give new work; they are not fixed sensory learner labels.
5. **Show and check, 3 minutes:** ask for today's relevant part values, whole and one reason. Keep first thinking/support, then a revision if needed. A model already supplied is not independently invented.
6. **Next invitation:** If every claim is changed, show a new valid and invalid small pair without error cues. If the reason is only looks wrong, match each claimed object to actual members before changing a label.

## Likely confusion and response

A check may say keep: not every claim is faulty. The actual part members and stated whole decide. If every claim is changed, show a new valid and invalid small pair without error cues. If the reason is only looks wrong, match each claimed object to actual members before changing a label.

## What to notice

Look for correct whole/part membership, matching quantities, the day's particular exchange/transfer/check and a supported reason. A correct whole alone does not prove every component. A child can choose a valid partition different from the model. Record actual quantity, access support and mathematical prompts; do not grade voice, handwriting, speed or motor independence.

[Child start](../child/day-48.md) · [Home](../home/home-48.md) · [Extra](../extras/extra-48.md) · [Worked contexts](../CONTEXTS.md) · [Assessment selector](../assessment/SELECT.md).

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