Subtract within 10

The first instance of the Take apart exercise is under the Early Math Math Mission. This exercise practices the order of the amount being subtracted and where it is being subtracted from. It continues strengthening a set theoretic model of arithmetic as an operation on objects.

Types of problems
There are two types of problems that show up in this exercise:
 * 1) Match the amount being subtracted and the answer: This problem describes a take away situation and asks the student to identify how much is being taken away and how much is left at the end. The student is also asked to type in the final answer to the problem.Ta-1.png
 * 2) Take away some from group: This problem describes a situation involving take away and the student is asked to correctly type in the answer to the subtraction problem in context.Ta-2.png

Strategies
These problems are straightforward making them easy to attain accuracy badges. However, due to the multiple things that are needed on the first problem type getting speed badges should be viewed as medium difficulty.


 * 1) On the first problem type, the number of objects in the bottom picture (if matched correctly) is the final answer to the subtraction problem since it represents how many are left in the word problem.
 * 2) This could easily change in the future, but it appears that 2 is the correct answer to ALL of the second type of problems. This is probably an accident at this time and may change in the future.