MP1: Mathematics Practise - Strategies for Perseverance and Insight in Mathematical Solutions
1.NBT.A.1: Counting to 120: Understanding Place Value and Representing Numbers
1.NBT.C.6: Subtracting Multiples of 10: Strategies and Reasoning for Positive Differences
1.OA.A.1: Solving Word Problems with Addition and Subtraction within 20
