SI units, prefixes and converting with unit analysis

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   A poster has an area of 3500 cm². Using 1 m = 100 cm, what is its area in m², Ari?

   0.35 m²
2. 2.

   A tabletop has an area of 12000 cm². Using 1 m = 100 cm, what is its area in m², Esme?

   1.2 m²
3. 3.

   How many cubic centimeters are in 1 mL, Kira?

   • 10
   • 1
   • 1000
4. 4.

   A park covers 2 km². How many square meters is that, Luz?

   • 2,000,000 m²
   • 20,000 m²
   • 2000 m²
5. 5.

   USGS lists water at 21 °C as 0.99802 g/cm³. What is that in kg/m³, Milo?

   • 998.02 kg/m³
   • 99.802 kg/m³
   • 0.99802 kg/m³
6. 6.

   Why does 1 g/cm³ equal 1000 kg/m³, Noah?

   • Both units shrink by the same factor
   • ÷ 1000 on top, ÷ 10⁶ on the bottom
   • A kilogram is 10⁶ grams
7. 7.

   About what mass does 250 cm³ of water at 21 °C (0.99802 g/cm³) have, Pia?

   • About 0.25 g
   • About 2505 g
   • About 249.5 g
8. 8.

   Ren says 1 m² = 100 cm² because 1 m = 100 cm. Agree or disagree?

   • Agree: the factor is 100
   • Disagree: it is 10,000 cm²
   • Agree: squares don't change it
9. 9.

   Tala says a conversion is set up correctly if the leftover units match the answer's units. Agree or disagree?

   • Disagree: numbers alone decide
   • Disagree: units don't matter
   • Agree: the units check it
10. 10.

    Zee says 2.5 kg of potatoes weighs more than 2500 g of potatoes. Agree or disagree?

    • Disagree: they are equal
    • Agree: 2500 is bigger than 2.5
    • Agree: kg is the bigger unit