By the end of the lesson the learner can add, subtract, multiply and divide integers using a number line and rules of signs.
By the end of the lesson the learner can find the cube of a number and the cube root by the factor method.
By the end of the lesson the learner can apply integers and cubes to real Kenyan situations such as temperature change and storage tanks.
Audio narration — reads aloud, works offline
Transcript
[0:00] Integers are the whole numbers together with their negatives and zero, for example minus three, zero and five.
[0:35] When we add a negative number we move left on the number line, and when we subtract a negative we move right, which is the same as adding.
[1:20] A cube is a number multiplied by itself three times. Five cubed is five times five times five, which is one hundred and twenty five.
[2:05] The cube root reverses this. The cube root of two hundred and sixteen is six, because six cubed is two hundred and sixteen.
[2:50] To find a cube root by factors, split the number into prime factors, group them in threes, and take one factor from each group.
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