Powers of 10/Exponents
What is 10³ in standard form?
1,000
Estimate the product of 42 × 19 by rounding to the nearest ten.
40 × 20 = 800
Find the product:
25 × 12
300
Find the product:
124 × 20
2,480
A movie ticket costs $12. How much do 15 tickets cost?
$180
Evaluate:
7 × 10⁴
Estimate 312 × 58 by using compatible numbers.
300 × 60 = 18,000
Find the product:
45 × 32
1,440
Find the product:
305 × 42
12,810 (Watch that middle zero!)
A crate holds 24 boxes of apples. Each box has 30 apples. How many apples total?
720 apples
Write 4 × 4 × 4 × 4 using an exponent.
4⁴
True or False:
48 × 21 is approximately 1,000.
True (50 × 20 = 1,000)
Find the product:
89 × 74
6,586
Find the product:
642 × 53
34,026
The school bought 125 tablets for $80 each. What was the total cost?
$10,000
Solve for n:
n × 10² = 5,300
53
Estimate 785 × 92. Will your estimate be an overestimate or underestimate?
Overestimate (800 × 90 = 72,000; both factors were rounded up)
Find the missing number:
60 times _____ = 2,400
40
Find the product:
999 × 15
14,985
A marathon runner trains 45 miles a week for 52 weeks. How many miles total?
2,340 miles
How many zeros are in the product of 50 × 10³?
4 zeros (50,000)
Explain why 35 × 25 is easier to estimate using compatible numbers than rounding.
Because 35 and 25 can easily use quarters/mental math (30 × 30 = 900 or 40 × 25 = 1,000).
Multiply:
98 × 99
9,702
Find the product:
807 × 60
48,420
A factory makes 342 widgets an hour. If it runs for 24 hours, how many widgets are made?
8,208 widgets