Addition and subtraction word problems 2

The first instance of  is under the Early Math Math Mission. This exercise uses various geometric models to increase understanding of addition and subtraction.

Types of Problems
There are four types of problems in this exercise:


 * 1) Block visual with two blanks: This problems asks the student to answer two questions using an accompanying block diagram.Aswp2-1.png
 * 2) Block visual with one blank in equation: This problem asks the student to use a block model and fill in one blank in an equation.Aswp2-2.png
 * 3) Circle model with one answer: This problem asks the student to use the circle sum model to fill in a single answer.Aswp2-3.png
 * 4) Find answer and select equations: This problem has an arithmetic question that the student is to solve. After solving, they are to select all equations that could have been used to solve the given problem.Aswp2-4.png

Strategies
This exercise is fairly simple to attain speed and accuracy badges. It is necessary to read carefully however!


 * 1) In problem type one, the answer is the same number to both blanks because the problem is trying to encourage connections between different forms of answers.
 * 2) In problem type four, there is always two correct options that need to be selected.
 * 3) In problem type four, research indicates the necessary operation is always subtraction.
 * 4) In problem type four, the incorrect answer choice among the three options has a number that is different from all other options (it is the sum situation instead of the difference).