Solve Subtraction Problems using Reversibility as a Strategy! - Ryan and Aidan.

Problem:

Elle takes $37.36 to Silvia Park. She buys a new pair of skinny jeans for $18.90. How much money does she have left?

Step 1: Read the problem.

Step 2: Put the problem into a maths equation. 37.36 - 18.90 =

Step 3: Choose a strategy. (Reversibility) So 18.90 + _____ = 37.36

Step 4: Solve the problem.

18.90 + 1.10 = 20 

20 + 17 = 37

37 + 0.36 = 37.36

So 1.10 + 17 + 0.36 = 18.46 

Learning Tip: Remember to add the correct numbers at the end to get your answer.