CHAPTER 5 ADDITION AND SUBTRACTION RELATIONSHIPS
How can relating addition and subtraction help you to learn and understand facts within 20?
How can addition and subtraction strategies help you find sums and differences? Add and subtract facts within 20 and demonstrate fluency for addition and subtraction within 10.
OPERATIONS AND ALGEBRAIC THINKING CC 1.OA.1 - REPRESENT AND SOLVE PROBLEMS INVOLVING ADDITION AND SUBTRACTION USE ADDITION AND SUBTRACTION WITHIN 20 TO SOLVE WORD PROBLEMS INVOLVING SITUATIONS OF ADDING TO, TAKING FROM, PUTTING TOGETHER, TAKING APART, AND COMPARING WITH UNKNOWNS IN ALL POSITIONS. BY USING OBJECTS, DRAWINGS, AND EQUATIONS WITH A SYMBOL FOR THE UNKNOWN NUMBER TO REPRESENT THE PROBLEM. CC.1.OA.3 - UNDERSTAND AND APPLY PROPERTIES OF OPERATIONS AND THE RELATIONSHIP BETWEEN ADDITION AND SUBTRACTION. APPLY PROPERTIES OF OPERATIONS AS STRATEGIES TO ADD AND SUBTRACT. CC.1.OA.6 - ADD AND SUBTRACT WITHIN 20 ADD AND SUBTRACT WITHIN 20, DEMONSTRATING FLUENCY FOR ADDITION AND SUBTRACTION WITHIN 10. USE STRATEGIES SUCH AS COUNTING ON; MAKING TEN, DECOMPOSING A NUMBER ELADING TO A TEN; USING THE RELATIONSHIP BETWEEN ADDITIONA AND SUBTRACTION AND CREATING EQUIVALENT BUT EASIER OR KNOWN SUMS BY CREATING THE KNOWN EQUIVALENT