Write Subtraction Equations

(F) Generate and solve problem situations when given a number sentence involving addition or subtraction of numbers within 20.

(D) Represent word problems involving addition and subtraction of whole numbers up to 20 using concrete and pictorial models and number sentences

(Y1) Represent and solve simple addition and subtraction problems using a range of strategies including counting on, partitioning and rearranging parts (ACMNA015)

1.OA.1 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, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.