ALL ABOUT DECIMALS
If a car gets 42.1 mpg on the highway, how many gallons of fuel will it use by traveling 340 highway miles? (round answer to tenths)
8.1 gallons
Write 259000000 in scientific notation
2.59 x 108
43 x 4-2
4
63% of what is 315?
500
When three or more numbers are multiplied, the product is the same regardless of the order of the multiplicands. For example (a x b) x c = a x (b x c)
Associative Property of Multiplication
Arrange from largest to smallest .808, .81, .8019, .807 .8
.81, .808, .807, .8019, .8
Write 0.000008 in scientific notation
8.0 x 10-6
t9 x t-3 / t12
1/ t6
25 is what percent of 300?
8 1/3 %
The sum of any number and zero is the original number. For example a + 0 = a
Identity Property of Addition
Subtract four and three-tenths from eleven and eighty-one hundredths.
7.51
Write 8.3409 x 103 in standard notation
8340.9
j-13 * j4 * j6
1/j3
90 is 75% of what?
120
When three or more numbers are added, the sum is the same regardless of the grouping of the addends. For example (a + b) + c = a + (b + c)
Associative Property of Addition
0.14208 / 0.64
.22
Write 1.958 x 10-4 in standard notation.
0.0001958
(5x3 y)4 / (20xy5)4
x8 / 256y16
The price of gasoline rose from $3.50 to $3.71 in one week. By what percent did the gas price rise?
6% rise in price
When two numbers are added, the sum is the same regardless of the order of the addends. For example a + b = b + a
Commutative Property of Addition
If you purchase a TV and pay $40 down and $32.60 a month for 8 months, what was the purchase price of the TV?
$300.80
Find the student’s error:
6540000 = 654000.0
654000.0 = 6.54 x 105
In the first step, the student should have added another zero after the decimal point, not placed the decimal point to the left of the final zero.
(2fg4)4 (fg)6
16f10 g22
The price of parking for 2 hours or less at the airport is increasing from $2.50 to $5.00. What is the percent that the price will increase?
100% price increase
Adding 0 to any number leaves it unchanged. For example a + 0 = a.
Addition Property of Zero