Math Journal: Word Problems: Story Problems: Joining Word Problems This product is part of a bundle: Check it out! Word Problem Bundle- growing productThis math story problem ‘Math Journal’ focuses on: Simple Joining Word Problems: start unknown, change unknown, and result unknown. Math problems can be classified into various problem types using the Cognitively Guided Instruction Approach. They are Joining, separating, comparing, whole/whole/part, multiplying, partitive division and measure