Odd and Even Numbers
Notes
1, 3, 5, 7, 9 ... are odd numbers.
2, 4, 6, 8, 10 ... are even numbers.
Remember that
even number + even number = even number
even number – even number = even number
odd number + odd number = even number
odd number – odd number = even number
even number + odd number = odd number
even number – odd number = odd number
EXAMPLES
1
Are the results of the following addition and subtraction odd or even?
(a) 3 + 8
(b) 4 + 6
(c) 6 – 2
(d) 9 – 5
(e) 12 – 5
(f) 10 + 5
(g) 5 + 9
(h) 6 + 9
(i) 8 – 4
(j) 7 + 8
Solution:
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
odd even even odd even even odd even even +
+
–
–
–
+
+
+
–
even = even = even = odd = odd = odd = odd = odd = even = Adapted:
Maths Olympiad – Unleash The Maths Olympian In You! (Junior 1)
© Singapore Asia Publishers Pte Ltd & Terry Chew. All rights reserved.
Reproducible for home/classroom use only.
STRICTLY NOT FOR SALE.
Look for other useful resources: www.sapgrp.com
odd
even
even
even
odd
odd
even
odd
even
1
PRACTICE
1 Are the results of the following addition and subtraction sums odd or even?
(a) 4 + 7
(b) 8 + 5
(c) 11 – 7
(d) 3 + 9
(e) 10 + 2
(f) 12 – 4
(h) 15 – 7
(i) 6 + 12
(j) 18 + 11
(k) 17 – 11
(l) 19 – 7
even + odd = odd
even + odd = odd
odd – odd = even
odd + odd = even
even + even = even
even – even = even
(g)
(h)
(i)
(j)
(k)
(l)
Solutions:
odd + odd = even
odd – odd = even
even + even = even
even + odd = odd
odd – odd = even
odd – odd = even
Adapted:
Maths Olympiad – Unleash The Maths Olympian In You! (Junior 1)
© Singapore Asia Publishers Pte Ltd & Terry Chew. All rights reserved.
Reproducible for home/classroom use only.
STRICTLY NOT FOR SALE.
Look for other useful resources: www.sapgrp.com
1.(a)
(b)
(c)
(d)
(e)
(f)
(g) 5 + 9
2