Think about it. As you are going through the grocery store, more than likely you are on a budget. You know how much you have to spend and you have no intention of going over (no matter how much your child wants that sugary cereal and is letting the entire store know!). So, as you walk the aisles and place items in your cart, you are either keeping a mental estimation going, or you are using the calculator on your phone. This is problem solving.
Math does not come at us in the form of algorithms.... it comes at us as a multi-step problem we have to work through. The same is being asked of our kids. The expectation is that students should be able to work through a real life situation (most of these situations ADULTS don't have to go through, much less a 10 year old) and be able to determine the best possible way to solve the problem and achieve the correct answer.
Please encourage your child to read. Please. The more exposure they have to written material the larger their vocabulary will become. The larger to vocabulary, the easier it is to decode meaning..... even in math.