Year three maths Common Core State StandardsOperations and Algebraic ThinkingRepresent and solve problems involving addition and subtraction. Add and subtract within 20. Work with equal groups of objects to gain foundations for multiplication. Number and Operations in Base TenUnderstand place value. Use place value understanding and properties of operations to add and subtract. Measurement and DataMeasure and estimate lengths in standard units. Relate addition and subtraction to length. Work with time and money. Represent and interpret data. Reason with shapes and their attributes. Add to collectionCreate new collectionHow likely are you to recommend Education.com to your friends and colleagues? What could we do to improve Education.com? Please note: Use the Contact Us link at the bottom of our website for account-specific questions or issues. What would make you love Education.com? What is your favorite part about Education.com?