{"schema_version":"teacher-skill-representation.payload.v1","representation":{"schema_version":"teacher-skill-representation.v1","skill_ref":"prealg.double-number-line.missing-value","domain_slug":"prealg","skill_slug":"double-number-line-missing-value","canonical_url":"/math/skills/prealg/double-number-line-missing-value","public_title":"Double number line missing values","family_ref":"module-family.prealg.ratio-rate-scaling.v1","family_name":"Ratio, Rate, Scaling, and Proportional Readiness","pattern_cluster_refs":[],"task_pattern_refs":[],"task_form_refs":[],"teacher_summary":"Double number line missing values builds ratio, rate, scaling, and proportional readiness through visual tasks, examples, and next-step routes.","teacher_explanation_md":"Use aligned double number lines to find missing values in proportional situations.","child_surface_summary_md":"Double number line missing values uses short visual tasks with clear answer actions and repairable mistakes.","common_mistake_tags":["Uses the same additive jump where a multiplicative relationship is required.","Reads values from different tick positions as a pair."],"hint_reveal_summary_md":"Hints keep the child oriented to the visible structure; reveals show the path without counting as independent evidence.","adaptation_summary_md":"Fresh independent work can move the child toward Core, Transfer, or Challenge routes; help use or confusion keeps support visible.","route_variant_refs":[],"age_band_refs":["age_6_7","age_8_9","age_10_11"],"practice_focus_refs":["practice-focus.balanced.v1","practice-focus.math-facts-times-tables.v1","practice-focus.fractions-feel-hard.v1"],"standards_refs":[],"school_program_refs":[],"challenge_refs":[],"story_fit_tags":[],"prerequisite_skill_refs":[],"next_skill_refs":["prealg.percent-as-fraction-100","prealg.rate.unit-rate-readiness","prealg.ratio-table.basic"],"next_family_refs":["module-family.dec.decimal-percent-reasoning.v1","module-family.prealg.equations-expressions-inequalities.v1","module-family.oa.models-word-problems.v1"],"public_example_refs":[],"retrieval":{"aliases":["Double number line missing values","prealg.double-number-line.missing-value","Ratio, Rate, Scaling, and Proportional Readiness"],"teacher_questions":["What does Double number line missing values mean?","How does Double number line missing values adapt for my child?","Can I see an example of Double number line missing values?"],"keywords":["double number line missing values","prealg","double-number-line-missing-value","ratio, rate, scaling, and proportional readiness"],"short_answer_public":"Double number line missing values builds ratio, rate, scaling, and proportional readiness through visual tasks, examples, and next-step routes.","canonical_links":[{"label":"Double number line missing values","url":"/math/skills/prealg/double-number-line-missing-value"}],"safe_to_quote_snippets":["Double number line missing values builds ratio, rate, scaling, and proportional readiness through visual tasks, examples, and next-step routes."],"example_refs":[]}},"task_forms":[],"examples":[],"preview_artifacts":[]}