Vocab
What is a decimal?
a number whose whole number part and the fractional part is separated by a decimal point.
what do we need to remember when adding/ subtracting decimals?
Line up the decimals properly
In your own words, what is rounding?
the process of replacing a number by another number of approximately the same value but having fewer digits
making a number more simple, by approximating which number it is closest to.
Rounding up or down by 1
Identify the whole number below
3.457
3
What is a percentage?
a rate, number, or amount in each hundred
What symbol do we use?
Decimal point
Add
1.06 + 2.11
3.17
What is the rule when we are rounding?
(the rhyme)
Look next door
5 or more, go up one more
4 or less, let it rest
identify the number in the tenths place below
4.567
5
What is the symbol used for percentages?
Please go draw it on the board.
%
Please go to the board and label the following number below...
(which part is the whole number and which part is the fractional part)
1.230
1 = whole number
.230 = the fractional portion of the number
Subtract
5.67 - 3.25
2.42
round to the nearest whole number
6.720
6
Identify the number in the thousandths place below
1.209
9
What (number) are percentages out of?
(hint: a percentage is always out of ...)
100
Please explain why we use the words,
whole number and fractional number
in reference to numbers involving decimals?
The number on the left side is the whole number, a number 1 or greater
the number on the right side is the fractional part typically meaning the value is less than 1 whole. much like a typical fraction (other than a mixed number)
Add (Remember your labeling!)
$6.10 + $4.79
$10.89
Round to the nearest hundredths place
(hint:identify place value first)
4.537
4.54
Identify the number in the hundredths place below
1.218
1
Give 3 examples of where we see percentages in everyday life!
-Gas
-cell phone battery
- sale prices in stores
-sales taxes (food, clothes, delivery purchases)
-Monetary values
In your own words
what is the definition of PLACE VALUE?
the value represented by a digit in a number on the basis of its position in the number
Solve the word problem below
You have $7.35. you owe your friend $5.25 for buying you lunch. after paying your friend, how much money do you have left?
(what operation are you performing)
subtraction
$ 2.10
Round to the nearest tenths place
5. 580
5.6
Please go to the board and label each place value of the numbers below!
4.907
4 -ones
9-tenths
0-hundredths
7-thousandths
Solve
You took a quiz!
the quiz was out of 45 points, you got 27 of the problems correct. Write your score as a fraction, then calculate the percentage!
Explain your answer!
27 / 45
0.6 x 100 = 60%