Volume... it's not just for great hair!
The amount of space an object takes up is called its ________________.
Volume
True or False
You can't switch the order in which you multiply numbers.
False!
Use the double and halve strategy to fill in the blank.
5 x 4 is the same as 10 x ___
2
Double the 5 to get 10, halve the 4 to get 2
True or false
43 x 11 is the same as (43 x 10) + (43 x 1)
True!
43 x 11= (43 x 10) + (43 x 1)
Solve the expression below mentally:
5 x (13 x 2)
130
The original expression is 5 x (13 x 2)
It's easier if you do (5 x 2) x 13
True or False
A cube with the dimensions of 1 x 1 x 1 is called a unit cube.
True
True or False
5 x 4 x 2 = 4 x 2 x 5
True
2 PART ANSWER!!
To find 50 x 14, what factor would you double when using the double and halve strategy? What would the new factor become after it is doubled?
Double the 50 to make 100! Easy peasy!
True or False
49 x 16 = (49 x 16) + (1 x 16)
False!
49 x 16 is not the same as (49 x 16) + (1 x 16). You would be adding 16 more.
Write an expression. Don't solve.
How can I find the volume of a rectangular prism that has a 15 by 21 base and 12 layers?
15 x 21 x 12
base=length times width
layers=height
A rectangular prism has a length of 2 cm, a width of 3 cm and a height of 4 cm. What is the volume of the rectangular prism?
24 cm3
Fill in the blank with the missing factor.
(2 x 10) x 5= (5 x 10) x ___
2
(2 x 10) x 5= (5 x 10) x 2
Solve using the double and halve strategy. Explain/show which factors you doubled or halved.
18 x 25
18 x 25
Double 25 to 50 Halve 18 to 9
50 x 9= 450
Fill in the blank to make both sides of the equation equal.
37 x 98= (37 x 100)- (37 x ___)
2
37 x 98= (37 x 100)- (37 x 2)
Write the expression. Do not solve.
To find 15 x 16, I double and halve
30 x 8
or
(15 x 2) + ( 16/2)
A rectangular prism has the following dimensions:
length=5 units
width=2 units
height=4 units
What is the AREA OF THE BASE?
10 u2
Remember: Base is equal to the length x widthFill in the blank to show an easier way to multiply. You do not need to solve.
87 x 12= ( 87 x ___) + (87 x ___)
Split the 12 into x10 and x2
87 x 12= (87 x 10) + (87 x 2)
2 PART ANSWER:
Show the steps to double and halve this expression until one of the factors reaches 100. What is the final answer?
36 x 25
36 x 25=
18 x 50=
9 x 100=900
Fill in the blank.
57 x ___ = (57 x 30) - ( 57 x 3)
27
57 x 27= (57 x 30)- (57 x 3)
30-3=27
To find 9 times 36, I find 10 x 36 and subtract 1 group of 36
(10x36) - (1 x 36)
or
(10 x 36) - 36
A rectangular prism has a volume of 60 mm3. The height is 5 mm. What is the area of the base?
12 mm2
Remember: Volume also equals Base X Height
60mm3=_____ x 5 mm
4 x ( ___ x 6)= 12 x 4
2
4 x (2 x 6)= 12 x 4
(Both sides equal 48)
Using the double and halve strategy, fill in the blank!
(16 x 12)=(24 x___)
8!
(16 x 12)=(24 x 8)
12 was doubled to get 24, so halve 16 to get 8
Fill in the blanks and solve.
(99 x 497) + (1 x 497) is the same as ____ x 497
which = ____
100 and 49,700
(99 x 497) + (1 x 497) is the same as 100 x 497 which = 49,700
Solve the expression below:
2 x (6 x 4) + 2 x (3 x 4) + 2 x (6 x 3)
2 x (6 x 4) + 2 x (3 x 4) + 2 x (6 x 3)=
2 x ( 6 x 4)=48
2 x (3 x 4)=24
2 x (6 x 3)=36
48 + 24 + 36= 108