When he works on a sudoku puzzle, Armando begins by filling in all the number 1's. Then he moves on to all the 2's, then 3 's, and so on until he finishes with the number 9's. Armando's problem solving strategy of filling in one number at a time until the entire puzzle is complete is based on a. using an analogy b. creating subgoals c. working backward d. experiencing insight

Armando's strategy while solving Sudoku puzzle is completing it one number at a time. He starts with number 1, fills all the cells with 1, then moves on to number 2, fills all the cells with 2, and so on until he reaches number 9. We need to find which category this strategy falls into among the given options.

a. Using an analogy: This strategy involves finding a relationship or connection between two different situations and applying the similar solution to the problem at hand. Armando's strategy does not involve finding connections or similarities between two different situations. b. Creating subgoals: This strategy divides the main goal into smaller, more manageable subgoals. Solving the puzzle by filling in numbers one at a time can be considered a form of creating subgoals, as each number represents a subset of the whole puzzle. c. Working backward: This strategy involves solving a problem by starting from the end or the desired outcome and working back to the beginning. Armando's strategy does not involve working backward; instead, he progresses sequentially from number 1 to number 9. d. Experiencing insight: Insight is a sudden understanding of a problem or situation, which leads to a solution. Armando's strategy is not based on a sudden understanding or an "aha!" moment. He follows a systematic approach.

After analyzing the given options, Armando's problem-solving strategy is best described as creating subgoals. He breaks down the main goal of completing the Sudoku puzzle into smaller, manageable subgoals by focusing on each number sequentially. So, the correct answer is: b. creating subgoals