O Level – Elementary Mathematics

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Arithmetic

1. Real numbers : {1,2,3,4,5,……..}
2. Whole numbers : {0,1,2,3,4,……..}
3. Integers : {……..-3,-2,-1,0,1,2,3,……..}
4. Negeative integers : {-1,-2,-3……..}
5. Postive integers : {1,2,3,4,5,……..}
6. Even numbers : {2,4,6,8,……..}
7. Odd numbers : {1,3,5,7,……..}
8. Prime numbers : {2,3,5,7,11,13,17,……..}

Prime numbers are natural numbers that have exactly two factors, 1 and itself

9. Rational numbers : {1/8, 1/2, 1,3,51/2,……..}

Rational numbers are numbers that can be written as a fraction, a/b where a and b are integers and b cannot be 0.

10. Irrational numbers : {root 2, root 5, pie……..}

Irrational numbers are numbers that cannot be expressed as exact fractions.

11. Perfect squares : {1,4,9,16,25,36,……..]

12. Real numbers are made up of rational and irrational numbers.

NOTE
ZERO is neither odd or even and is neither positive or negative.

From O-Level Elementary Mathematics Singapore Tutor