Åk 6–9
  • Start
  • 1. Welcome to Operators and Calculation Rules
  • 2. Addition and Subtraction
  • 3. Multiplication And Division
  • 4. Factorization
  • 5. Setting Up Calculations
  • 6. Powers
  • 7. Square Roots
  • 8. Mathematical Rules
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    English/فارسی
    3.8 Exercises – Multiplication and Division

    1. Write the following additions as products?

    Ex: 2 + 2 + 2 + 2 = 4 · 2
    a)
     
    b)
     
    c)
     
    d) 1 + 1 + 1 + 1 + 1
     
    e) 9 + 9 + 9 + 9 + 9 + 9 + 9
     
    f) 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5
     
    g) 12 + 12 + 12 + 12 + 12 + 12
     
     
    		 

    2. Which divisions represent the following subtraction?
    Ex: 8 - 2 - 2 - 2 - 2 = 0         
      8 ÷ 2
    a) 20 - 5 - 5 - 5 - 5 = 0
     
    b)
     
    c)
     
    d)
     
    e)
     
    f)
     
    g) 44 - 11 - 11 - 11 - 11 = 0
     
     
    		 

    3. Calculate according to the examples below.
    Ex: 58 · 7  
      (50 · 7) + (8 · 7) = 350 + 56 = 406
    a) 96 ÷ 3
     
    b) 27 · 5
     
    c) 84 · 6
     
    d) 62 ÷ 2
     
    e) 936 ÷ 3
     
    f) 385 · 9
     
    g) 437 · 6
     
     
    		 

    4. Calculate by using approximation.
    Ex: 26 · 37 ≈ 30 · 30 = 900
    a) 74 · 28 ≈
    b) 75 ÷ 9 ≈
    c) 39 · 23 ≈
    d) 57 ÷ 26 ≈
    e) 83 ÷ 41 ≈
    f) 87 ÷ 28 ≈
    g) 27 · 94 ≈
     
    		 

    5. Calculate by using approximation.

    Ex: 110 · 58 ≈ 100 · 60 = 6,000
    a) 814 · 69 ≈
    b) 565 ÷ 18 ≈
    c) 452 · 78 ≈
    d) 656 ÷ 67 ≈
    e) 18,431 ÷ 358 ≈
    f) 87,825 ÷ 289 ≈
    g) 591 · 712 ≈