Understanding integer multiplication

Understanding integer multiplication

In this section, we will learn the multiplication of positive and negative integers. At the beginning, diagrams will be used to help us getting familiar with the concept. We will then practice more with actual numbers.
Basic Concepts: Place value, Determining Common Factors, Adding integers
Related Concepts: Order of operations (PEMDAS), Using exponents to describe numbers, Exponent rules

Lessons

  • Introduction
    Introduction to integer multiplication
  • 1.
    Write the multiplication statement for each diagram.
    a)

    Understanding integer multiplication with diagrams

    b)

    Write multiplication statement of integer multiplication expressed in diagram

    c)

    Representing integer multiplication in integer chips

  • 2.
    Solve.
    a)
    (-4)×(+6)

    b)
    (+7)×(+3)

    c)
    (-2)×(-9)

  • 3.
    Dave can do 15 sit-ups in one minute. How many sit-ups can he do in 8 minutes?
  • 4.
    A building has 8 stories above ground and 4 stories below ground. Each story has a height of 5m.
    a)
    What is the total height of the building above ground?

    b)
    What is the total depth of the building below ground?

  • 5.
    Mary spends $30 per week on meals for a year. Sally spends $125 per month on meals for a year. Who spends more money on meal, and by what amount?
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3.
Multiplying and Dividing Integers
3.1
Understanding integer multiplication
3.2
Multiplying integers
3.3
Understanding integer division
3.4
Dividing integers
3.5
Applications of integer operations
NZ Year 9 Maths
Don't just watch, practice makes perfect