Lesson 5

Mass vs. Number

Est. Class Sessions: 3–4

Daily Practice and Problems

Teacher Notes
X

TIMS Task

  1. 20 cm; 2 × 10 = 20 cm
  2. 28 cm;
    6 + 3 + 2 + 2 + 2 + 4 + 2 + 2 + 2 + 3 = 28 cm
  3. Possible response: A is a regular decagon because it has all equal sides and equal angles.

R. Walking around Decagons

A decagon is a shape with ten sides. Find the perimeter of each decagon. Write a number sentence for each. You will need a centimeter ruler.

  1. _________________________
  2. _________________________

  1. Which decagon is a regular decagon? __________
    How do you know?