Learning+Progressions-Develop+an+understanding+of+whole+number+relationships,+including+grouping+in+tens+and+ones+and+apply+place-value+concepts


 * Group and count objects by 2s, 5s, and 10s
 * Find a number that is 10 more or 10 less than a given number
 * Group numbers in 10s and 1s in more than one way and explain why the total remains the same
 * Explain and use strategies for remembering addition and subtraction facts to 20
 * Use mental strategies, invented algorithms, and traditional algorithms based on knowledge of place value to add and subtract two-digit numbers