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-place-value · A trade that keeps the amount: model

Every visible word in order:

1. A trade that keeps the amount: model

2. Read, draw, say, sign or direct. One useful part can be enough.

3. MODEL · 405 = 4 hundreds + 0 tens + 5 ones

4. 405 = 3 hundreds + 10 tens + 5 ones

5. 400 + 0 + 5 = 300 + 100 + 5

6. Trade one hundred for ten tens; keep the amount.

7. Zero means no tens in the standard form.

8. A nonstandard count can exceed 9 without changing value.

9. hundreds

10. 4

11. tens

12. 0

13. ones

14. 5

15. SubjectNest original model / blank · CC BY4.0 · contributors2026

Complete geometry/meaning: Two complete equations show405 standard4hundreds0tens5ones and nonstandard3hundreds10tens5ones, with equal totals. Three labelled display boxes show the standard form4,0,5. They are filled models, not empty own response areas or measured physical pieces.

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.