Evaluate each
expression.
expression.
5 x (14 x 2)
140
180 x 16 = 8 x ___
360
To find 36 times 25, I double and halve.
36 x 25
(3 x 4) x 6
72 cubic units
There are 46 fifth graders in Cross Country. Today, they're going to run in the Cowbell Classic. If each minivan can take 6 students, how many minivans do they need to take?
46 / 6
8 minivans
70
12 x 17 = 6 x ___
34
To find 15 x 16, I double 15 and halve 16 and then multiply.
(15 x 2) x (16 / 2)
OR
30 x 8
((2 x 3) x 4) + ((2 x 4) x 2)
40 cubic units
Mrs. Crain needs 175 granola bars for the fifth grade field trip. The bars come in boxes of 10. How many boxes does Mrs. Crain need to buy?
175 / 10
18 boxes
(50 x 56) - (1 x 56)
504
8 x 5 = 4 x ___
10
To find 27 x 9, I find 27 times 10 and remove 1 group of 27.
(27 x 10) - (27 x 1)
((2 x 6) x 2) + ((4 x 12) x 1)
72 cubic units
Mr. DeBaker bought matching school T-Shirts for the 4 fifth grade teachers. The total cost of the shirts was $66. How much did each shirt cost? Write an expression, then solve.
66 / 4
$16.50
(98 x 47) + (2 x 47)
4,700
44 x 7 = 14 x ___
22
To find 49 times 73, I multiply 73 times 50 and take off one group of 73.
(73 x 50) - (73 x 1)
((70 x 2) x 4) + ((35 x 1) x 8)
840 cubic units
There are 100 people on the swim team. Today, they are going to a big swim meet on the other side of town. If each van can take 15 people, including the driver, how many vans will they need to take everyone?
100 / 15
7 vans
2 x (5 x 3) + 2 x (3 x 4) + 2 x (5 x 4)
94
50 x 4 = ___ x 2
25
To find the volume of a box that has a 19-unit by 22-unit base and 27 layers, I multiply the dimensions of the base first and them multiply by the number of layers.
(19 x 22) x 27
((2 x 2) x 5) + ((2 x 4) x 1) + ((1 x 2) x 1)
30 cubic units
A rectangular prism contains 396 cubes. Each layer has 33 cubes. How many layers does the rectangular prism have?
396 / 33
12 layers