Place Value
17 hundredths
0.17 or .17
When adding and subtracting decimals, you must make sure that the decimal points in both numbers are _______ ___.
Lined up!
Two tenths times eight = ?
Hint : write in standard form first.
0.2 x 8 = 1.6
Taylor earns $5.50 per hour babysitting. She works 6 hours per day.
How much will she earn after babysitting on Saturday and Sunday?
Taylor will earn $66.
How do we write the following: "10 to the power of 4"?
104
Consider the numbers .3 and 3.
The decimal point was moved ONE place to the right, changing the number from .3 to 3. This means the number 3 is ___ times larger than .3.
10 times larger
23.33
0.4 x 8 =
3.2
Peter bought 5 pounds of meat. He used 2.6 pounds to make burgers. With the rest, he made 6 portions of spaghetti. How much meat was in each portion of spaghetti?
0.4 pounds of meat was in each serving of spaghetti.
Express the following multiplication sentence as an exponent.
10x10x10
103
Consider the numbers 47 and .47
The decimal point was moved TWO places to the left, making the number smaller.
How many times smaller is .47 when compared to 47?
100 times smaller
42 + 18.4 = ?
60.4
0.3 x 6 =
1.8
Karen went to Dunkin and got a Caramel Macchiato for $4.49. She also got an Iced Americano for $3.79. She paid with a $10. What is her change?
($4.49 + $3.79 = $8.28).
$10.00-$8.28= $1.72
Karen's change is $1.72
Express the following multiplication sentence as an exponent.
10x10x10x10x10x10
105
109,382.93
Chad says the 9 in the thousands place and the 9 in the tenths place have the same value, which is 9. Chad says this is true because the digit is 9 no matter what place it is in. Why is Chad wrong?
Even though the digit 9 is the same, the place value matters. 9 in the thousands place = 9,000, while a 9 in the tenths place = 9/10 or 0.9.
273.012 + 12.0 = ?
295.012
12.8 x 9 =
115.2
A YouTuber is looking at his ad revenue for the month of October. He gets paid $0.03 for each time an ad is viewed. If one particular ad was viewed 9,320 times in October, how much ad revenue did he make?
$279.60
Use the following to help you round numbers with decimals:
"Find the place, look next door. 5 or more, raise the ____, 4 or less, let it ______."
5 or more, raise the score.
4 or less, let it rest.
Shannon says that 20 tenths is equal to 2 ones.
Is Shannon correct? Draw or explain your thinking on your whiteboard.
20 tenths is equal to 2 ones.
Shannon is correct.
Suzanne went to Price Chopper and spent $17.82 on steak, $4.99 on potatoes, and $3.49 on green beans. She paid the cashier with a $50 bill. What is her change?
($17.82+$4.99+$3.49=$26.30)
$50.00-$26.30=$23.70
Suzanne will get $23.70 back.
Karen went to TJ Maxx to buy candles for Christmas gifts. She picked out 8 candles for the same price: $14.99. How much did Karen pay for all 8 candles?
Karen paid $119.92 for the candles.
Three friends pooled their money together to go to the movies. All together, they have $38.90. If tickets cost $8.50 each, how much money do they have left to spend on snacks and drinks?
(8.50x3= $25.50 on tickets)
$38.90 - $25.50
= $13.40 left for snacks
Compare using the proper symbol ( <, >, or = ).
129.089 ____ 128.099
129.089 > 128.099