Double and Halving
Fill in the missing number in the equation below.
18 × 120 = 9 × _________
240
Andre paid $63.00 for 4 super-size pizzas. How much did each pizza cost?
$15.75
Tell whether the equation is true or false.
39×13=(39×13)+(1×13)
False
Riley counted the number of balls in one layer of a box, 34. The box has 8 layers. How many balls can the box hold?
a) 242 balls
b) 272 balls
272 balls
(7×2)×5=
70
To find 3 × 12, I double and halve.
Which numerical expression represents the statement above?
a) 6 x 6
b) 3 x 12
6 x 6
Four friends made 63 cookies and shared them equally. How many cookies did each friend get?
If there is a remainder, how do you handle it?
15 cookies
3 cookies left over, cut each cookie in 4 equal pieces
Tell whether the equation is true or false.
67×18=(67×20)−(67×2)True
How many 1×1×1 cubes are in a rectangular prism with a length of 6, width of 4, and height of 3?
72 cubes
5×(14×2)=
140
_____ x 26 = 18 x 13
9
There are 63 kids in the After-School Club. 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?
16 cars
To find 27×9, I find 27 times 10 and remove 1 group of 27.
Which numerical expression represents the statement above?
a) (27×10) − (1×27)
b) (27×10) − 10
(27×10) − (1×27)
(7 x 4) x 4 = 112
(50×56)−(1×56)=_________
2,744
Which equation represents the statement below?
To find 16 times 25, I double and halve.
a) 4 ×50
b) 8 ×50
8 x 50
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 minivan can take 15 people, how many minivans will they need to take everyone on the team?
If there is a remainder, how would you handle it?
7 cars
Write T or F next to the equation to show whether it is true or false. Then, describe below how you can use number relationships to tell whether the equation is true or false without having to find the answer on both sides.
(2 × 5) × 4 = 2 × (5 × 4)
True
(6 x 6) x 3 = 108 cubes
2×(5×3)+2×(3×4)+2×(5×4)= ________
94
Fill in the blanks to make the equations true.
_________ × 24 = 8 × 12 = ________
4 x 24 = 8 x 12 = 96
12 layers
Write and solve an equation to represent the statement below.
To find 15 times 27, I multiply 10 times 27 and add it to 5 times 27.
(15 x 27) = (10 x 27) + (5 x 27)
Write a numerical expression to represent the statement below. Include any grouping symbols (such as parentheses) you need to make the expression as accurate as possible.
To find the volume of a box that has a 19 by 22 base and 27 layers, I multiply the dimensions of the base first and then multiply by the number of layers.
(19 x 22) x 27
Fill in the blanks to make the equation true.
47 × 98 = (______ × 47)−(2 × 47) = ________
47 × 98 = (100 × 47)−(2 × 47) = 4,606