Another problem with almost all worksheets is that they don't prevent incorrect answers. Self_checking worksheets just let the student know they did something wrong__after the fact. I am a firm believer in the concept that, if at all possible, learning should be structured in small chunks in such a way that there is very little possibility for error. Worksheets often allow for mistakes to be made and then to be repeated many times. A mistake that gets practiced is extremely difficult to correct. This especially happens when worksheets are used as time fillers or baby sitters and the work isn't really being supervised.
The heart shape is fantastically useful for teaching all sorts of mathematical problems, including geometry. Have your child cut out a heart shape from paper and use it to help them understand symmetry. How many lines of symmetry does a Heart Have? Help kids learn about patterns by using colored hearts or a series of Valentine's Day pictures. Introduce them to simple patterns; for instance red heart, green heart, red heart. From here you can make the patterns more complex by making them longer or including a higher degree of variation. Valentine's Day is a perfect opportunity for educating your child about many math problems; from simple arithmetic and word problems to patterning and geometry. There are many ideas to choose from that you're sure to find engaging and rewarding for both you and your child. So give them a try next Valentine's Day and see if your child will be struck by Cupid's arrow and feel the love for math.