Rules to Remember
- 0 in terms of enumeration quality
- when we add nought to a number, the answer is always that number, for example:
- 23 + 0 = 23
- 679 + 0 = 679
- 0 + 52 = 52
- 1 in terms of its multiplication quality
- when we multiply any number by 1, the answer is always that number, for example:
- 7 x 1 = 7
- 458 x 1 = 458
- 1 x 75 = 75
- prime numbers to at least 100
-
Prime numbers are numbers that are divisible by exactly 2 positive integers- these will end up being themselves and one. The prime numbers from 1 – 100 are:
- 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
- Fractions
- Fractions consist of two numbers. The top number is called the numerator. The bottom number is called the denominator. If the numerator and the denominator is equal the answer is always 1.
numerator
denominator
- To add two fractions with the same denominator, add the numerators and place that sum over the common denominator.
- Identifying Equivalent Decimals and Fractions
Decimals are a type of fractional number. The decimal 0,5 represents the fraction 
. The decimal 0,25 represents the fraction 
. Decimal fractions always have a denominator based on a power of 10.
We know that is equivalent to 
Therefore, the decimal 0,5 is equivalent to 
or 
, etc.
- Some common Equivalent Decimals and Fractions:
-
0,1 and
-
0,2 and
-
0,5 and
-
0,25 and
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0,50 and
-
0,75 and
-
and
or 
or 1