1.2 Cubes and Cube Roots

• Cubes of numbers by multiplication, mathematical tables and calculator
• Cube roots of numbers by factor method, mathematical tables and calculator
• Volume of a cube as length cubed; stacking unit cubes

• work out cubes of numbers by multiplication in real-life situations
• determine cubes of numbers from mathematical tables in different situations
• determine cube roots of numbers by factor method in different situations
• determine cube roots of numbers from mathematical tables in different situations
• determine cube and cube roots of numbers using a calculator
• apply cubes and cube roots in real-life situations

“How do we work out the cubes of numbers?”

“How do we work out the cube roots of numbers?”

“Where do we apply cubes and cube roots in real-life situations?”

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1. A cube is n times n times n
   40 min · 1 practice tasks · quiz
   A cube number is three equal factors. It is the volume of a cube whose edge is n units.
2. Cubes by multiplication in Kenya
   40 min · 1 practice tasks · quiz
   Find n cubed by squaring first, then multiplying by n again. Use Kenyan lengths and money-free volumes.
3. Cubes from mathematical tables
   40 min · 1 practice tasks · quiz
   Read cubes of decimals from mathematical tables, then check one value by multiplication.
4. Cube roots by grouping factors in threes
   40 min · 1 practice tasks · quiz
   The cube root undoes a cube. Group prime factors in threes; leftover factors mean it is not a perfect cube.
5. Calculator cubes and a Kenyan tank
   40 min · 1 practice tasks · quiz
   Use a calculator to cube and to cube-root, then apply volume of a cubic tank in metres and litres.