# Full source-aid alternatives

Every visible word and source relationship is available below. Read only the selected useful part; retain complete access. Paper, usual communication and adult-directed exact recording require no colour, vision, touch, printer or device. Ordinary models and held-source own aids are explicitly separate; keep keys and reserves unseen.



## model-missing-part · How many more? A model

**Every visible word in order:**

1. How many more? A model
2. Read, draw, say, sign or direct. One useful part can be enough.
3. MODEL · Need 46 invitation slips; 18 are ready.
4. 18 + ? = 46    or    46 - 18 = 28
5. 18 → 20 (+2) → 40 (+20) → 46 (+6)
6. 2 + 20 + 6 = 28 more slips
7. Check: 18 + 28 = 46
8. The model does not tell us actual supplies or delivery.
9. SubjectNest original model / blank · CC BY4.0 · contributors2026

**Complete geometry/meaning:** A fictional46-needed/18-ready project is formulated as18+?=46 or46−18=28; counted-up jumps2,20,6 sum28more, checked by18+28. All visible equations are filled staff-supported ordinary models, not child evidence.

**No-image route:** Read this selected full text; child chooses their own response and usual communication or directs an adult. Keep child decisions/actual mathematical reasoning distinct from supplied source facts, adult operation and hints. No required physical making, actual survey/project, learner result or broader attainment is implied. Original words/geometry CC BY4.0; system sans-serif only, no font binary.