Exercise 7D
Question 1
Here are two different factor trees for 84 . Write the missing numbers.
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Question 2
Write the prime factorisation of each of the following numbers.
(i) 28
(ii) 40
(iii) 75
(iv) 156
(v) 180
(vi) 256
(vii) 336
(viii) 495
(ix) 770
(x) 1260
(xi) 1800
Multiple Choice Questions (MCQs)
Tick (✔) the correct option.
3. What is the number of prime factors of 30030 ?
(a) 4
(b) 5
(c) 6
(d) None of these
4. The number of distinct prime factors of the smallest 5 -digit number is
(a) 2
(b) 4
(c) 6
(d) 8
5. The sum of the prime factors of 1729 is
(a) 13
(b) 19
(c) 32
6. In which of the following expressions prime factorisation has been done?
(d) 39
(a) $36=2 \times 2 \times 9$
(b) $95=1 \times 5 \times 19$
(c) $42=2 \times 3 \times 7$
(d) $100=2 \times 2 \times 25$
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