G8

Copyright © Swun MathCopyright © Swun Math (^) Grade 8 Unit 4 Lesson 12 T TE

Final Check for Understanding

• Are students able to articulate metacognition?


• Are students able to articulate what they would do differently to solve the problem?


• How did you solve the problem?


• Are the students’ answers reasonable?


• How would you describe the problem in your own words?


• In what way does this problem connect to other mathematical concepts?


• What approach are you considering trying first?

Reflective Closure

• Were students able to demonstrate their knowledge of solving linear equations?


• Were students able to verbalize and use mathematical language?

Answer Key

1. Draw each side separately. Remember there are 2 of each side, so the area of each side must be doubled.
   Drawing the sides separately is an excellent resource for understanding surface area.


2. Volume = l·w·h
   6(4.5)x = 229.5 cubic inches
   27 x = 229.5
   27 27
   x = 8.5 inches; The height is 8.5 in.

3. A=2(12)(16)

A=24(16)

A=384 square inches

4. A=(2푥푥+12)16
   384=32x+192
   푥푥=6 in flap

Front & back

12

푥푥 Top & bottom^

12

(^8) sides
8
푥푥
푥푥 12 in 푥푥^
16 in