Estimation
What is a good estimate for 103 x 68 ?
7,000
(103 is about 100 and 68 is about 70. 100 x 70 = 7,000)
683 x 7 =
4,781
9,600 ÷ 96 =
100
The area of a yard is 800 square feet. If the length of the yard is 40 feet, what is the width of the yard?
20 feet
a. 27
b. 270
c. 2,700
d. 27,000
d. 27,000
If 72 x 16 = 1,152, which of the following are also true? Select all true equations.
a. 1,152 ÷ 72 = 16
b. 1,152 ÷ 16 = 72
c. 16 x 72 = 1,152
d. 72 ÷ 1,152 = 16
e. 16 ÷ 1,152 =72
A, B, and C are all true
322 ÷ 7 =
46
The area of the base of a box is 830 square centimeters. It has a height of 18 centimeters.
Will the volume be greater than 20,000 cubic centimeters or less than 20,000 cubic centimeters? How do you know?
It will be less than 20,000 cubic cm because 830 is less than 1,000 and 18 is less than 20 and 1,000 x 20 = 20,000
Choose the number that is closest to the value of the expression 8,241 ÷ 4.
a. 20
b. 200
c. 2,000
d. 20,000
c. 2,000
324 x 43 =
13,932
950 ÷ 25 =
38
The area of a base of a box is 322 square inches. The box is 14 inches wide. How long is the box?
23 inches
Choose the number that is closest to the value of the expression 86 x 81.
a. 720
b. 7,200
c. 810
d. 8,100
b. 7,200
264 x 58 =
15,312
2,052 ÷ 18 =
114
The area of the base of a box is 830 square centimeters. It has a height of 18 centimeters. What is the volume of the box?
14,940 cubic centimeters
Choose the number that is closest to the value of the expression 945 ÷ 15.
a. 60
b. 600
c. 6,000
d. 60,000
a. 60
709 x 51 =
36,159
5,400 ÷ 15 =
360
A box has a volume of 10,000 cubic feet. What could the dimensions (length, width, and height) of the box be?
Answers will vary, they need to multiply together to get 10,000.
Ex: 100 x 10 x 10
Ex: 20 x 5 x 100