{"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 Y1 Number add sub to 20","label":"addition, subtraction, within 20; calculate, represent.","public_slug":"curratom-england-nc-y1-number-addition-and-subtraction-add-subtract-one-digit-two-digit-to","route":"/math/standards/uk-england-nc/curratom-england-nc-y1-number-addition-and-subtraction-add-subtract-one-digit-two-digit-to","data_json_route":"/math/data/standards/uk-england-nc/curratom-england-nc-y1-number-addition-and-subtraction-add-subtract-one-digit-two-digit-to.json","data_markdown_route":"/math/data/standards/uk-england-nc/curratom-england-nc-y1-number-addition-and-subtraction-add-subtract-one-digit-two-digit-to.md","skill_count":3,"skills":[{"title":"Place Value Tens Ones","route":"/math/skills/nbt/place-value-tens-ones","family_name":"Base-Ten Place Value and Whole-Number Notation","standards":[]},{"title":"Add Within 20 Strategies","route":"/math/skills/oa/add-within-20-strategies","family_name":"Whole-Number Operations and Fact Fluency","standards":[]},{"title":"Sub Within 20 Strategies","route":"/math/skills/oa/sub-within-20-strategies","family_name":"Whole-Number Operations and Fact Fluency","standards":[]}],"crawler_summary":"England Y1 Number add sub to 20 maps to 3 math skills."}}