Powers of 10
Which is equivalent to 104?
A. 10 x 4
B. 10 x 10 x 10 x 10
C. 10 x 10 x 10 x 10 x 10
D. 1,000
E. 10,000
F. 100,000
B. 10 x 10 x 10 x 10
E. 10,000
Which is the most reasonable estimate for 68 x 221?
A. 60 x 300
B. 70 x 200
C. 600 x 200
D. 700 x 300
B. 70 x 200
What exponential form completes this equation
42 x _______ = 420,000
104
What is the product of 573 x 63? Use an algorithm
573
x 63
_______
1719
+ 34380
________
36,099
A bus company charges $83 for a ride from one city to another. During the last trip, the bus had 42 fares. How much money did the bus company earn?
$3, 486
A square has side length 10. Which represents the area of the square? Choose all that apply.
A. 10 x 2
B. 10 + 10 + 10 + 10
C. 102
D. 10 x 10
E. 40
F. 100
C. 102
D. 10 x 10
F. 100
A rectangular field measures 416 feet long and 52 feet wide. About how much is the area of the field?
Sample answer:
400 x 50 = 20,000 square feet
50 x _____ = 500000
104
Calculate 64 x 538 using partial products
1,800
480
2,000
120
+ 32
__________
34,432
In its frame, a rectangular poster measures 68 inches long and 45 inches wide. How much wall space does the poster cover? Explain the strategy you used to find the answer.
3,060 square inches
Sample answer: I used an area model to multiply, then i added the partial products: 2,400 + 300 + 40 = 3,060
Which is equivalent to 38 x 105? (standard form number)
3,800,000
Which product is correct? Choose all that apply.
178 x 4 = 482
397 x 6 = 2,382
513 x 5 = 25,515
923 x 8 = 7384
397 x 6 = 2382
923 x 8 = 7384
The average attendance at a town's high school soccer games is 4,153 people per game. How many people attended the team's 8 home games this season? Give an estimate and the exact number. Explain your strategies.
32,000 ; 33,224 people
Sample answer: I rounded 4,153 to 4,000 and multiplied by 8 to get 32,000. I used an algorithm to multiply 8 times 4,153:
4,153
x 8
_______
33,224
Which product is shown by the area model? (see example on the board)
A. 70 x 300 = 21,000
B. 70 x 346 = 24,220
C. 74 x 346 = 24,524
D. 74 x 346 = 25,604
D. 74 x 346 = 25,604
A theater has 1,475 seats. For a show's 39 performances, every seat was filled. How many people saw the show? Explain the strategy you used to find the answer.
57,525 people
Sample answer: I used an algorithm to multiply, first by multiplying 9 times 1,475 and then by multiplying 30 times 1,475. Then, I added the partial products.
1475
x 39
______
13275
+44250
_______
57,525