Complete neutral source
Two separate fictional records use cards. Record 1:□−175=428, where 175 cards are used and 428 remain. Record 2: 620−185=□+240. Keep the records separate. There is no supplied history of a learner’s earlier work.
Eligibility
After unknown start and two-sided equality have both been taught, e.g. Days 57–58. One record or one prompt may be enough; do not require all four for a useful observation.
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
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For Record 1, say what the box counts and find it.
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Substitute your Record 1 value into its original equation and check.
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For Record 2, find the box value. Show what the complete known side is first.
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Check both full sides of Record 2 after substitution.
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.
For Record 1, say what the box counts and find it.
[Empty response area]
Substitute your Record 1 value into its original equation and check.
[Empty response area]
For Record 2, find the box value. Show what the complete known side is first.
[Empty response area]
Check both full sides of Record 2 after substitution.
[Empty response area]