Power of Maths: Paper 1 – Section 1
Solution (a) U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20} P = {2, 3, 5, 7, 11, 13, 17, 19} C = {4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20}
(b) U P 5 11 1
(c) (P ∪ C) = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20} 1 ∉ (P ∪ C)
(d) P ∩ C = {} This is called the null set.
(e) E = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20} E ⊄ C, as not all elements in E are also in C: 2 ∉ C
EXERCISE 1
1. (a) What is the sum of 2, 3 and 5? (b) What is the difference of 20 and 6? (c) List the fi rst 15 natural numbers. (d) What is the product of 6 and 8? (e) What is 4 times 8?
(f) Find the quotient of 10 and 2? What is 2 called in this situation?
(g) Write 2 to the power of 4 mathematically. Calculate it.
(h) Find the product of 2, 3 and 5. Also fi nd the product of 3, 5 and 2. What do you notice?
(i) Write out 5 × 2 in longhand and then calculate it.
(j) Write out 25 in longhand and then calculate it.
2. Calculate the following operations. Do them fi rst without a calculator and then check your answers on your calculator:
(a) 25 + 6 – 2 + 1 – 3 (b) (4 + 3) – (2 – 1) (c) (2 + 1)3 – 1 (d) 2(6 – 2) + 7 × 3 – 5 (e) 3(20 – 19)5 + 5 × 3
(f) 1 + 5 × 3 ________
8
(g) 22 + 4 × 2 − 3 ____________
3 (h) (i)
__________ 22 − 1
4 + 2(5) + 7
______________ 22
24 − (1 + 1)2 + 23
(j) 21 + 4 × 2 + 32 _____________
20 − 1 10 2 3 7 13 17 19 4
10 16
9 15 6
12 20 18 C 8 14
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