Evaluate the Expression
(9 x 2) x 5
90
To find 26x9, I find 26 times 10 and remove 1 group of 26.
(26x10)-(1x26)
(5 x 3) x ____ =60
4
48 divided by 12
4
5 x (13 x 2)
130
To find the volume of a box that has a 18 unit by 21 unit base and 37 layers, I multiply the dimensions of the base first and then multiply by the number of layers.
(18 x 21) x 37
8x5=4x___
10
Thirty-eight 5th graders at CIS are going on a field trip to the Aquatic Resource Center. They are riding in vans that each hold 9 students. How many vans will they need for everyone to get to the ARC?
5 vans. 4 vans will be full, but there will be 2 more students, so they will need a fifth van.
(50x58)-(1x58)
2,842
To solve 18x20, I find double 18 and then multiply by 10.
(18 x 2) x 10
12x16=____x8
24
The principal bought matching school T-shirts for the 4 fifth grade teachers. The total cost of the shirts was $57. How much did each shirt cost?
$14.25
2x(6x3)+2x(3x4)+2x(6x4)
108
To solve 31x8, I find 3 x 8, multiply by 10, and then add 1 group of 8.
(3 x 8 x 10) + (1 x 8)
4x___=2x26
13
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 16 people, including the driver, how many vans will they need to take everyone?
7 vans.
(18 x 21) x 30
11,340
To solve 16 x 18, I double and halve
(16/2) x (18x2) OR 8x36
180x16=6x____
480
A rectangular prism contains 528 cubes. Each layer has 44 cubes. How many layers does the rectangular prism have?
12 layers.