Algebraic reasoning. The student applies mathematical process standards to identify and apply number patterns within properties of numbers and operations in order to describe relationships. The student is expected to:
(A) recite numbers forward and backward from any given number between 1 and 120;
(B) skip count by twos, fives, and tens to determine the total number of objects up to 120 in a set;
(C) use relationships to determine the number that is 10 more and 10 less than a given number up to 120;
(D) represent word problems involving addition and subtraction of whole numbers up to 20 using concrete and pictorial models and number sentences;
(E) understand that the equal sign represents a relationship where expressions on each side of the equal sign represent the same value(s);
(F) determine the unknown whole number in an addition or subtraction equation when the unknown may be any one of the three or four terms in the equation; and
(G) apply properties of operations to add and subtract two or three numbers.