Transcript Whole Number _Decimal Review

Whole Number & Decimal Review
Place Value : Whole and decimal
Know the face value, place value and total value of a digit.
Example:
In the number
Digit
Face Value
the 5 has
the 1 has
the 9 has
the 3 has
the 2 has
5
1
9
3
2
445,879,704,106 .302
Place Value
1 billions
hundreds
one millions
tenths
thousandths
Total Value
5,000,000,000
100
9,000,000
3/10 or 0.3
2/1000 or 0.002
Know and be able to write in the 3 forms:
Standard Form:
567,972.43
Word Form: five hundred sixty-seven thousand, nine hundred
seventy-two and forty-three hundredths
Expanded Form: 500,000.00 + 60,000.00 + 7,000.00 + 900.00 +
70.00 + 2.00 + .40 + .03 = 567,972.43
To compare whole numbers and decimals - always start at the largest place
(on the left) and compare families.
> or < ?
You have a license to
Remember, the mouth of the gator is open to
chow down on the larger number!
Legally cheat with decimals - use it!!
324,568 < 324,586
4.6
> 3.60
0.236
56.71
> 0.23
<
56.943
Add 0 to ends
Use License to add and subtract with decimals. Line up decimals and legally
cheat (It’s a GOOD THING!).
28.972
Examples:
4.53 + 28.972 =
+ 4.530
33.502
6.3 - 3.598 =
6 .300
- 3.598
2.702
Be able to round whole numbers and decimals.
1. Underline the place you are rounding the number.
2. Draw an arrow to the number on the right - The Boss who does the
talking.
3. If the Boss is aRAMBO, the underlined number is bumped up to the
next higher number and everything to the right becomes a zero.
4. If the Boss is aWIMP, the underlined number is kept and everything
to the right becomes a zero.
365,421
365,400
3.258
3.3
When estimating with addition and subtraction - Round to the greatest
place of the smallest number (Not smallest digit)
or
Think of it as rounding to the biggest place all the numbers share.
785,632
32,852
+ 8,967
786,000
33,000
+ 9,000
$39.25
- 4.75
828,000
Find ordered pairs on a coordinate grid: Start at 0.
Go across the x axis then up the Y axis.
Think---
Taxi down the runway, then fly up in the air!
or
Run across the floor and jump up to the ceiling!
$39.00
- 5.00
$34.00