### Home > CC1 > Chapter Ch4 > Lesson 4.1.2 > Problem4-17

4-17.

A team of students worked on problem 4-12. The team’s work is shown below. Unfortunately, the expressions, descriptions, and diagrams got mixed up! Match the counting method, word description, and diagram that describe the same strategy. Homework Help ✎

 Counting Methods Word Descriptions Diagrams a. $4·10−4$ 1. Start in one corner and count 9 four times around the picture frame. A. b. $10+9+9+8$ 2. Take a side length of 10 four times and take away the four corners. B. c. $9·4$ 3. Take the entire 100's grid and subtract the inside part of the picture frame. C. d.$(10·10)−(8·8)$ 4. Take the top length, then add the two vertical sides and add the bottom. D.