Rounding and Bounds PRET homework

Again, I have used a style of outline present within MissB'sResources on her PRET homeworks page, to create a homework for my year 9-4 group on the topic of Rounding to decimal places, significant figures, and using the upper and lower bounds to perform calculations. I had already covered the work in lesson, and wanted to see how much they were still able to complete on their own after being away from the topic for a couple of weeks.
To differentiate, I simply give different questions to students, depending on where their ability was within lessons, so they would not all necessarily need to do all the basic questions. I also set as an extension for the more able in the group to create their own question and bring it back to the teaching group a week after the homework was handed in to be marked.