Wetzel
Math 155
1.2 Estimation, Graphs, and Mathematical Models
Place Values
Whole Numbers: Decimals:
9,762, 513, 048 0.421836
8 ones 4 tenths
4 tens 2 - hundredths
0 hundreds 1 - thousandths
3 thousands 8 ten-thousandths
1 ten thousands 3 hundred-thousandths
5 hundred thousands 6 - millionths
2 million
6 ten million
7 hundred million
9 billion
Rounding Whole Numbers
Steps:
1.) Identify the digit where rounding is to occur.
2.) If the digit to the right is 5 or greater, add 1 to the digit to be rounded. Replace all digits to the right with zeros.
If the digit to the right is less than 5, do not change the digit to be rounded. Replace all digits to the right with zeros.
Ex.:
1.) Round 87, 459 to 2.) Round 1,306, 717 to
a.) the nearest thousand. a.) the nearest hundred.
b.) the nearest ten. b.) the nearest hundred thousand.
3.) Round 0.15832 to 4.) Round 47.020481 to
a.) three decimal places. a.) four decimal places.
b.) the nearest hundredths. b.) the nearest tenths.
HW: p.23 #1-15odd