# Whole-dollar model


## Access

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.

## Complete different guided source

A pretend AUD budget $300 has costs $147 and $128.

## Complete new source

A fictional AUD budget $250 has invented costs $126 and $98.

## Complete own invitation

An invented AUD budget $400 has costs $186 and $195.

## Entry and teach

Teach dollars as a single unit; no cents or real spending needed.

## Guided instruction

275 cost, 25 left. Invite each relationship before the answer; teach missing facts and name help.

## Id

NEXT21

## Materials

Broad paper/empty bar or line/place-value headings as useful; usual communication; no actual stock/handling/purchase.

## Observe and follow up

Receive one available own relationship before staff possibility. If it matches criterion, offer another small new context later; this is not automatic mastery. If not, return to the entry relationship and fade one hint. Record the actual mathematical help. If access/time is not available, change access or sitting rather than marking wrong.

## Relationship to check

Teach the observed missing relationship in a new ordinary domain; not an answer repetition or further held item.

## Session sequence


1. Read the new source and name units/wanted quantity. Teach dollars as a single unit; no cents or real spending needed.

2. Model on separate adult paper. Cost 126+98=224 dollars; compare 224≤250.

3. Guide a different complete source. A pretend AUD budget $300 has costs $147 and $128. 275 cost, 25 left.

4. Receive one own attempt. An invented AUD budget $400 has costs $186 and $195. Staff reference only: 381 cost, 19 left.

5. Compare available work with: Additive cost model and budget constraint have consistent dollar roles. Choose one follow-up offer; never infer independence from a copied model.

## What to look for

Additive cost model and budget constraint have consistent dollar roles.

## Staff own possibility

381 cost, 19 left.

## Teacher model

Cost 126+98=224 dollars; compare 224≤250.

## Timing

An adjustable 10–20 minute ordinary lesson, unpiloted; split/stop after one useful part.

## Title

Whole-dollar model