Mr Fredstrom

3NBT2 Calls for students to be fluent with different methods of addition and subtraction. This Common Core resource emphasizes subtraction using number lines, base 10 shapes, and standard form. Numbers are below 250- great resource for introducing the number line concept (using expanded form) and regrouping using base 10 shape drawings. There are 4 sheets with 3 problems on each with plenty of room for students to draw out their work.