Transcript Whole Numbers and Tables: Writing, Rounding, and Inequalities

Whole Numbers and Tables:
Writing, Rounding, and
Inequalities
Section 1.1
Objectives
• Write word name from place value name
Write place value name from word name
• Write inequality statement about 2
numbers
• Round a given whole number
• Read tables
Objective 1:
Write Word Names From Place
Value Names and
Place Value Names From Word
Names
Objective 1
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Digits
Natural numbers (Counting numbers)
Whole numbers
Hindu-Arabic System
Digits and Commas
Positional Base 10 (Decimal) System
Place Value
Place Value Name
Expanded Form
Word Name
Three Digit Groups
Objective 1
• To write the word name from a place value
name
– From L to R, write the word name for each set
of three digits followed by group name (except
units)
– Insert a commas after each group name
Objective 1
• To write a place value name from a word
name
– Identify the group names
– Write three-digit number before each group
name, followed by a comma
– (The first group, on the left, may have fewer
then three digits)
– It is common to omit the comma in 4-digit
numerals
Objective 1
• Combination of place value notation and
word name
Objective 2:
Write an Inequality Statement
About Two Numbers
Objective 2
• Less than:
<
• Greater than:
>
• To write an inequality about two numbers:
– Insert < between the numbers if the number
on the left is smaller
– Insert > between the numbers if the number
on the left is larger
Objective 3:
Round a Given Whole Number
Objective 3
• ≈ means approximately equal to
• Approximate by rounding
• To round a number to a given place value
– Draw an arrow under the given place value
– If digit to right of arrow is 5, 6, 7, 8, or 9, add one to
digit above arrow (round to larger number)
– If digit to right of arrow is 0, 1, 2, 3, 4, do not change
the digit above arrow (round to smaller number)
– Replace all digits to right of arrow with zeros
Objective 4:
Read tables
Objective 4
• Find correct column and row that
describes needed information
• Then read data at intersection