Adding and Subtracting Decimals
Standards 
Questions to Consider 
5.NBT.7 Add, subtract, multiply, and divide decimals to hundredths, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
Helpful Videos 

Strategies
Adding Decimals
Subtracting Decimals