Fractions and Decimals

Exam Prep Study Notes (Things to remember) 

Divisibility by 2

The last digit is even (0, 2, 4, 6, or 8). 

Example - 1294: 4 is even.

Divisibility by 3

Sum the digits. The result must be divisible by 3.

Example - 405 → 4 + 0 + 5 = 9 and 636 → 6 + 3 + 6 = 15 which both are clearly divisible by 3.

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Tips

Multiply fractions
To multiply fractions, just multiply the numerators and then the denominators. 
Meaning of 'of'
In Math, the word 'of' is often used to denote multiply. 
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Place values

FRACTION NAME DECIMAL NUMBER FRACTION
tenth
0.1 1/10
hundredth
0.01 1/100
thousandth
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METRIC PREFIXES

Text Symbol Factor Power
yotta
Y 1000000000000000000000000 1024
zetta
Z 1000000000000000000000 1021
exa
E 1000000000000000000 1018
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ROMAN NUMERALS

Symbol I V X L C D M
Value 1 5 10 50 100 500 1,000

 

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