What are the abbreviations for: a. millimetre b. centimetre c. metre d. kilometre

Here are the answers to the questions.

4. What are the abbreviations for:

• a. millimetre: $\boxed{\text{mm}}$
• b. centimetre: $\boxed{\text{cm}}$
• c. metre: $\boxed{\text{m}}$
• d. kilometre: $\boxed{\text{km}}$

5. Give examples of objects that you would measure in:

• a. mm: $\boxed{\text{Thickness of a coin}}$
• b. cm: $\boxed{\text{Length of a pencil}}$
• c. m: $\boxed{\text{Height of a door}}$
• d. km: $\boxed{\text{Distance between cities}}$

6. Compare the following: Remember to state the measurement unit.

• a. Two pencils of different lengths:
  • Pencil 1: $15 \text{ cm}$
  • Pencil 2: $18 \text{ cm}$
• b. Two books of different lengths:
  • Book 1: $20 \text{ cm}$
  • Book 2: $25 \text{ cm}$
• c. Two books of different widths:
  • Book 1: $12 \text{ cm}$
  • Book 2: $15 \text{ cm}$
• d. The length of a sheet of paper with the length of a sheet of paper that is folded once:
  • Unfolded: $29.7 \text{ cm}$
  • Folded once (lengthwise): $29.7 \text{ cm}$
• e. The width of a sheet of paper with the width of a sheet of paper that is folded once:
  • Unfolded: $21 \text{ cm}$
  • Folded once (widthwise): $10.5 \text{ cm}$
• f. The height and width of the door:
  • Height: $2 \text{ m}$
  • Width: $0.8 \text{ m}$
• g. The length and width of your desk:
  • Length: $120 \text{ cm}$
  • Width: $60 \text{ cm}$
• h. The length and width of the classroom:
  • Length: $8 \text{ m}$
  • Width: $6 \text{ m}$
• i. The length and width of any outside area:
  • Length (garden): $10 \text{ m}$
  • Width (garden): $5 \text{ m}$

Conversions:

• a. $1 \text{ m } 42 \text{ cm} = \boxed{142 \text{ cm}}$
• b. $5 \text{ m } 24 \text{ cm}$