GRADE FIVE MATHEMATICS

Last Week’s Answers Exercise 1. 1. 15 inches, 94.2 in 2

(b) 78.54 cm2 4. (a) 5 cm

Hello boys and girls,

I hope that you are enjoying your August vacation. Last week you named the parts of a circle. You calculated the radius, diameter, perimeter, and area of circles. This week we will revisit some concepts related to sets. .

●A set

is a collection of ● These objects are sometimes called members or 2,463 m2 elements. ● There may be no elements, one element or many elements or members in a set.

● A set is usually denoted by a capital letter. curly brackets or braces { } is used when defining a set. ‘the set of’ ● A pair of

objects. ● The curly brackets { } means

● A set may be defined by Example.

1. B is the set of odd numbers between 3 and 12. (a) Describe the set in words. (b) List the members of the set.

(a) B = {odd numbers between 3 and 12} (b) B = {5, 7, 9,11}

describing it This set has four members or elements. Study these other examples: Examples 2. List the members of the set of C = {6, 8} 2. 616 cm 2 (c) 31.42 cm composite This set has two members 6 and 8.

SETS

or by listing the members. numbers from 5 to 10 3. List the even number which is prime. E = {2} This set has one numeral, 2. List the odd number which is even. O = {} This set is empty. It has no members.

Exercise List the members of the following sets. 1. O = {odd numbers between 23 and 32} 2. F = {the factors of 8} 3. C = {composite numbers less than 10} 4. T = {circles with five sides} 5. R = {Roman numerals for 3,7,10} 6. H = {Hindu Arabic numerals for xiv, xxv, xix} 7. P = {the set of even prime numbers greater than 2} 8. Describe the following sets in words. 9. G = {2,4,6, 8} 10. C = {1, 2, 3, 4, 5} 11. J = {5, 10, 15,20} 12. K = {1, 2, 3, 6, 9, 18} 13. N = {0, 1, 2, 3, 4} 14. P = {3,6, 9,12,15,18} 15. R = { i, iii, v}

16. M = {} Goodbye boys and girls. Continue enjoying your vacation. ☺☺☺