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Prime Deductions

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Prime Deductions

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Lesson details

Key learning points

  1. In this lesson, we will use our knowledge of prime factorisation to deduce the factors of numbers.

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Starter quiz

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5 Questions

Q1.
Express 42 as a product of its prime factors
2 x 21
2 x 3 x 3
Correct answer: 2 x 3 x 7
6 x 7
Q2.
Express 144 as a product of its prime factors.
12 x 12
Correct answer: 2 x 2 x 2 x 2 x 3 x 3
2 x 2 x 3 x 3 x 3 x 3
2 x 6 x 2 x 6
Q3.
Express 80 as a product of its prime factors.
2 x 2 x 2 x 10
Correct answer: 2 x 2 x 2 x 2 x 5
2 x 4 x 2 x 5
8 x 10
Q4.
Express 35 x 10 as a product of its prime factors.
35 x 2 x 5
350
5 x 7 x 10
Correct answer: 5 x 7 x 5 x 2
Q5.
Express 1750 as a product of its prime factors
10 x 175
2 x 5 x 175
2 x 5 x 5 x 35
Correct answer: 2 x 5 x 5 x 5 x 7

Exit quiz

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5 Questions

Q1.
75 = 15 x .....
15
25
3
Correct answer: 5
Q2.
168 = ..... x 21
14
42
6
Correct answer: 8
Q3.
Which of these is not a factor of 42?
14
21
Correct answer: 4
6
Q4.
One of the factors of 168 is a square number.
False
Correct answer: True
Q5.
Which two numbers will multiply to make a square number?
245 and 30
30 and 42
Correct answer: 42 and 168
72 and 245

Lesson appears in

UnitMaths / Prime factor decomposition

Maths

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