Åk 6–9
 
English/فارسی
4.4 Exercise - Factorisation
1. Divisibility
Ex: Which of the following numbers are divisible by 5?
  25, 100, 66, 128
  Answer: 25, 100
a) Which of the following numbers are divisible by 2?
  334, 118, 441, 783, 72, 45, 28, 1,370
 
b) Which of the following numbers are divisible by 3?
  433, 42, 56, 86, 81, 78, 72, 156, 1,036
 
c) Which of the following numbers are divisible by 5?
  54, 45, 710, 551, 90, 105, 2,008, 620
 
d) Which of the following numbers are divisible by 9?
  36, 518, 81, 781, 456, 72, 993, 117
 
e) Which of the following numbers are divisible by 2 and 3?
  34, 18, 444, 12, 15, 36, 519, 144, 3,633
 
 
 
2. Divide the following numbers into their prime factors.
Ex: 12 = 2 · 2 · 3
a) 24
 
b) 40
 
c) 72
 
d) 81
 
e) 100
 
f)
 
g) 120
 
h) 135
 
i) 150
 
j) 189