Welcome to the inefficiently named Year 5 Efficient Strategies for Adding and Subtracting Decimals step (although, I guess it does exactly what it says in the title) - what a mouthful. Within the step, we have a lot of resources, so be sure to check them out. But right here, right now - this is the Year 5 Efficient Strategies for Adding and Subtracting Decimals challenge - two questions designed to get the brains turning and the mathematical language flowing.