# The missing refill · my response


## Complete neutral source

A fictional kit needs 725 labels in total. It has 468 labels available. Find the further labels needed: 468+□=725. The box stands for a whole-number value. No real refill is supplied.

## Eligibility

After unknown addend, part/whole and substitution have been taught, e.g. Day 56. No assumed mastery from resource-week labels.

## Access and help

Read or sign the exact source and prompts neutrally, enlarge them, or scribe the learner’s chosen words. A figure, operation, regrouping, equation role or check supplied by an adult is mathematical help and is recorded as such. Show, draw, type, sign or use usual communication. One component can be enough; pause/pass/finish are choices. Four own spaces are genuinely empty. Models, criteria and next lessons stay on separate staff pages.

## First later limit

First/later are opportunity labels, not fixed order, matches, calibrated difficulty or learning gain. If source/answer exposed, record that rather than claim unseen.

## Prompts


1. What does the box count? Describe the known part and the whole.

2. Find a value for the box with a useful strategy.

3. Put your value into the original equation and check it.

4. A fictional note says “the box is 725 because that is the answer after the equals sign”. Keep or repair it with a reason.

Four own areas initially empty. Reading the native complete source on the same page retains typed words. Reloading, closing or leaving this page can lose them. Use paper if you need a record.

## What does the box count? Describe the known part and the whole.

[Empty response area]

## Find a value for the box with a useful strategy.

[Empty response area]

## Put your value into the original equation and check it.

[Empty response area]

## A fictional note says “the box is 725 because that is the answer after the equals sign”. Keep or repair it with a reason.

[Empty response area]