1. Given decimal notation, write a word name.
Convert between decimal notation and fraction notation.
Given a pair of numbers in decimal notation, tell which is larger.
Round decimal notation to the nearest thousandth, hundredth, tenth, one, ten, hundred, or thousand.
Section 5.1

2. The decimal notation 42.3245 means
The decimal notation means
4 tens + 2 ones + 3 tenths + 2 hundredths + 4 thousandths + 5 ten-thousandths
We read this number as
“Forty-two and three thousand two hundred forty-five ten-thousandths.”
The decimal point is read as “and”.
Section 5.1

3. To Write a Word Name from Decimal Notation
a) write a word name for the
whole number (the number named to the left of the
decimal point),
b) write the word “and” for the decimal point, and
c) write a word name for the number named to the
right of the decimal point, followed by the place
value of the last digit.
Three hundred ninety-seven
Three hundred ninety-seven and
Three hundred ninety-seven and six hundred eighty-five thousandths
Section 5.1

4. Write a word name for the number in this sentence: The top women’s time for the 50 yard freestyle is seconds.
Write a word name for the number in this sentence: The one-mile (1.609-km) land speed record is 1, km/h, set by Andy Green in Thrust SSC in the Black Rock Desert, Nevada, USA, on October 15,
Section 5.1

5. Finding fraction notation (improper and mixed number):
If you read the number properly, the decimal notation and the mixed number are the same.
Write fraction notation for Do not simplify.
Write as a fraction and as a mixed numeral
Section 5.1

6. Going from Fraction Notation to Decimal Notation When the Denominators are a Power of Ten
Write decimal notation for each.
Section 5.1

7. Comparing Numbers in Decimal Notation –
Change one or more of the numbers so they all go out to the same number of decimal places.
Do this by adding zeros.
Which is larger or 3.2?
Which is larger 0.08 or 0.105?
Section 5.1

8. To round to a certain place:
a) Locate the digit in that place.
b) Consider the digit to the right.
c) If the digit to the right is 5 or greater, round up; if the digit to the right is 4 or lower, round down.
Section 5.1

9. Round 0.072 to the nearest tenth.
Homework:
Problems 1,9 - copy the number, then write the number is words
Problem 51 – copy the problem, answer the question, justify your answer in words or by showing work.
Problems 83, 85 – copy the original number, state to what place you are rounding, give the answer, justify your answer in words.
Round to the nearest hundredth.
Section 5.1