# Rebuild the beginning


## 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 theatre uses 248 tickets, has 356 left.

## Complete new source

A fictional puzzle box uses 126 cards and has 387 left.

## Complete own invitation

An invented mask box uses 175 labels, has 468 left.

## Entry and teach

Teach□−4=9: used 4 joins left 9 to get 13.

## Guided instruction

604 start; 604−248=356. Invite each relationship before the answer; teach missing facts and name help.

## Id

NEXT13

## 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□−4=9: used 4 joins left 9 to get 13.

2. Model on separate adult paper. Starting 513=126+387; 513−126=387.

3. Guide a different complete source. A pretend theatre uses 248 tickets, has 356 left. 604 start; 604−248=356.

4. Receive one own attempt. An invented mask box uses 175 labels, has 468 left. Staff reference only: 643 start; 643−175=468.

5. Compare available work with: Unknown start is rebuilt from used and left, with roles explained. Choose one follow-up offer; never infer independence from a copied model.

## What to look for

Unknown start is rebuilt from used and left, with roles explained.

## Staff own possibility

643 start; 643−175=468.

## Teacher model

Starting 513=126+387; 513−126=387.

## Timing

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

## Title

Rebuild the beginning