{"system":{"system_id":"uk_england_nc","public_slug":"uk-england-nc","label":"England National Curriculum: Mathematics","official_source_urls":["https://www.gov.uk/government/publications/national-curriculum-in-england-mathematics-programmes-of-study/national-curriculum-in-england-mathematics-programmes-of-study","https://www.gov.uk/national-curriculum"]},"standard":{"system_id":"uk_england_nc","system_slug":"uk-england-nc","system_label":"England National Curriculum: Mathematics","code":"England Y2 Number inverse missing number","label":"inverse operations, missing number, checking; use, solve, verify.","public_slug":"curratom-england-nc-y2-number-addition-and-subtraction-inverse-relationships-addition-subtraction-to-check-calculations","route":"/math/standards/uk-england-nc/curratom-england-nc-y2-number-addition-and-subtraction-inverse-relationships-addition-subtraction-to-check-calculations","data_json_route":"/math/data/standards/uk-england-nc/curratom-england-nc-y2-number-addition-and-subtraction-inverse-relationships-addition-subtraction-to-check-calculations.json","data_markdown_route":"/math/data/standards/uk-england-nc/curratom-england-nc-y2-number-addition-and-subtraction-inverse-relationships-addition-subtraction-to-check-calculations.md","skill_count":1,"skills":[{"title":"Equations Unknown Add Sub","route":"/math/skills/oa/equations-unknown-add-sub","family_name":"Equations, Variables, Expressions, and Inequalities","standards":[]}],"crawler_summary":"England Y2 Number inverse missing number maps to 1 math skill."}}