Addition and Subtraction
- 1. Grade 3 Mathematics Unit TO ADD OR SUBTRACT? THAT IS THE QUESTION! Central idea: Mathematicians develop different strategies to solve addition and subtraction problems. Questions:How are addition and subtraction facts connected?Are there different strategies I could use for addition and subtraction? Which way works best for me and why?How does knowing adding and subtracting skills help me?Why do mathematicians estimate? By the end of this unit I will have developed the SKILLS to…-know my fact families to 20 (S)-be able to complete fact and number families (S)-be able to solve addition and subtraction multi-digit number stories (D,S)-be able to add and subtract multi-digit numbers (D, S)-be able to estimate answers for multi-digit addition and subtraction problems (D)-complete “What’s My Rule?” tables (D, S)-use basic facts to solve fact extensions (D, S) Concepts: REFLECTION, CONNECTION & PERSPECTIVE Summative Assessment:You will be asked to solve a word problem and explain your strategies.