Math Notes
Place Value
Billion Period
Millions Period
Thousands Period
Ones Period
Decimal Point
Tenths
Hundredths
Thousandths
Forms
•Standard form – 500
•Word form – five hundred
•Short Word form – 5 hundred
•Expanded form – (5 x 100) or 500
Roman Numerals
1=I 2=II 3=III 4=IV 5= V 6=VI 7=VII 8=VIII 9=IX 10=X
15=XV 20= XX 25=XXV 30=XXX 35= XXXV 40= XL 45=XLV 50=L 55=LV 60= LX 65=LXV 70 =LXX 75= LXXV 80= LXXX 85=LXXXV
90=XC 95=XCV 100=C 200=CC 300=CCC 400=CD 500=D 600=DC 700=DCC 800=DCCC 900=CM 1,000=M
Round Whole Numbers and Decimals
Find the place you are rounding too.
Look at the digit to its right
If the digit is less than 5 round down.
Ex 2.72 = 2.70
↑
If the digit is 5 or greater round up.
Ex 2.76 = 2.80
↑