Evaluate the Expression
(7 x 2) x 5 = _______________
70
True or False: Explain
(99 x 497) + (1 x 497) = 100 x 497
True because 1 group of 497 was subtracted from the expression 100 x 497, so that will need to be added back.
To find 15 x 18, I double and halve.
30 x 9
What is the volume of the 2 x 8 x 5 rectangular prism? (don't forget your label)
80 cubic units
Four friends made 57 cookies and shared them equally. How many did each friend get?
14 1/4 cookies
5 x (19 x 2) = _______
190
98 x 36 = (100 x 36) - (2 x 36)
True because 2 groups of 36 were added to 98, so they will need to be subtracted.
To find 9 x 26, I find 10 times 26 and subtract 1 group of 26
10 x 26 - (1 x 26)
What is the volume of a 4 x 5 x 6 rectangular prism?
120 cubic units
There are 57 kids in the Latchkey. Tomorrow they are going to the park. If each car can carry 4 kids, how many cars will they need to get to the park?
15 cars
50 x 64 - (1 x 64)
3136
18 x 120 = 9 x 240
True because 18 is halved and 120 is doubled.
To find 15 times 32, I multiply 10 times 32 and add it to 5 times 32.
(10 x 32) + (5 x 32)
Width: 5 cubic units
Length: 2 cubic units
Height: 6 cubic units
What is the volume?
60 cubic units
Andrew paid $57.00 for 4 super size pizzas. How much did each pizza cost?
$14.25
2 x ( 6x4) + 2 x (3x4) + 2 x (6 x 5) = __________
372
(3 x 4) x 6 = 3 x (4 x 6)
True because the commutative property says you can multiply in any order. The product will be the same.
To find 42 times 25, I double and halve.
21 x 50
Write and solve an equation to represent this rectangular prism.
( 4 x 3 ) x 7 = 84 cubic units
Thirty-four kids showed up for the first soccer practice. The coaches organized them into groups of 3 for warm ups. How many groups were there? What did you do with the remainder?
11, one group will have 4 kids.
(2x8) x (32 / 2) = _______
256
58 x 17 = (60 x 17) + (2 x 17)
False: 2 groups of 17 were added to 58 to make 60, so they would need to be subtracted not added.
To find the volume of a box that has a 19 by 22 base and 27 layers, I multiply the dimensions of the base by the height.
(19 x 22) x 27
Brad counted the number of balls in one layer of a box, and found out there were 22. The box has 9 layers. How many balls can the box hold in all?
198 balls
Brandon and his three friends raked leaves every weekend for a month. By the end of the month, they earned $93.00. They paid $4.00 to Brandon's brother for helping out on the last day. Then the four friends divided the rest of the money equally. How much did each friend get?
$22.25