Double & Half
To solve 24 times 16, I double 24 and halve 16. Write an expression to represent this scenario.
24 x 16 = 48 x 8
Write an expression to represent doubling 25 and halving 60. Then, write the answer.
50 x 30 = 1,500
What is $66 divided between 4 people?
$16.50
What is the volume of a cube with side lengths 8 cm?
8 x 8 x 8 = 512 cubic cm
Solve:
(4 x 9) x 5
180
Fill in the blank:
_________ x 15 = 30 x 24
12
Write an expression to represent this situation:
To find 49 x 23, I multiply 50 by 23 and take away one group of 23.
(49 x 23) = (50 x 23) - (1 x 23)
If 39 brownies are divided between 4 people, how many brownies does each person get?
12 and 1/4
What is the volume of a rectangular prism with side lengths 9 cm, 4 cm, and 6 cm?
9 x 4 x 6 = 216 cubic cm
Solve:
(20 x 15) - (1 x 15)
285
Fill in the blank:
12 x 260 = 24 x ____________
130
Write and evaluate an expression to represent the following situation: to find 14 x 16, I double 16 and halve 14.
14 x 16 = 32 x 7 = 224
Three friends want to share 34 balloons. How many balloons should each person get?
11 R1
If a rectangular prism has 57 cubes in one layer, and it has 9 layers, how many cubes are there in all?
57 x 9 = 513 cubes
Solve:
(3 x 9) x 7
189
Fill in the blank:
12 x 15 = 6 x 30 = _____________
180
Write and evaluate an expression to represent this situation:
To find 29 x 15, I multiply 30 by 15 and take away one group of 15.
29 x 15 = (30 x 15) - (1 x 15)
Solve:
78 divided by 9.
8 R6
If a rectangular prism has 32 cubes in one layer, and it has 8 layers, how many cubes are there in all?
32 x 8 = 256 cubes
Solve:
(30 x 18) - (1 x 18)
522
22 x 4 = _________ x 44 = __________
Write and evaluate an expression to represent this situation:
To find 99 x 12, I multiply 100 by 12 and take away one group of 12.
(99 x 12) = (100 x 12) - (1 x 12) = 1,188
What is $71 divided between 5 people?
$14.20
Which rectangular prism has the greatest volume?
A) a prism with 45 cubes in one layer, and a total of 8 layers
B) a prism with 33 cubes in one layer, and a total of 9 layers
A): 45 x 8 = 360 cubes
B): 33 x 9 = 297 cubes
Rectangular prism A has the greater volume.
(45 x 40) - (1 x 45)
1,755