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Powers of 10
Estimation
Division
Multiplication
It’s a surprise
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Category 1 questions follow
Question
What is 8.56 x 102 =
Answer
856
Question
What is 1/10 of 450,000
Answer
4,500
Question
What is 7.8 ÷ 1000 =
Answer
.0078
Question
Fill in the missing factor using a POWER OF 10
78.8 x _______ = 78,800
Answer
103
Question
Fill in the missing divisor using a POWER of 10
154.6 ÷ _______ = 1.546
Answer
102
Category 2 questions follow
Question
Use estimation to solve
1506 ÷ 298 =
Answer
3
Question
6798 x 485 =
Answer
35,000
Question
4504 ÷ 886 =
Answer
5
Question
Use estimation to select all of the following whose
quotient is more than 4
A.
B.
C.
D.
879 ÷ 299 =
16,809 ÷ 378 =
21.04 ÷ 4 =
123 ÷ 21 =
Answer
B,C,D
Question
Use estimation to select all of the following whose
quotient is more than 5
A. 27.9 ÷ 4.8 =
B. 23.98 ÷ 4 =
C. 9.87 ÷ 5 =
D. 103 ÷ 28 =
Answer
A&B
Category 3 questions follow
Question
Explain in words how to use multiplication to check
the answer for 67 ÷ 12 = 5 R7
Answer
Since multiplication is the inverse of division,
multiply 12 x 5 and add your remainder. 12 x 5 = 60
60 + 7 = 67
Question
A rectangular garden has an area of 864 m2. If one
side is 27 m, how long is the other side?
Answer
32 m
Question
Generate and solve a problem with the same answer
as the following: 156 ÷ 8 = 19 R4
Answer
Answers vary – teacher to check & verify
Question
Jenny works for Kohls and has 132 sweaters to ship
and send to other stores. If she has to ship ALL the
sweaters, and only 9 sweaters fit in a box, how many
boxes does she need to ship ALL the sweaters?
Answer
Since 132 ÷ 9 = 14 R6 and all sweaters have to go,
she needs 15 boxes
Question
Using decimal division prove that even though
33 ÷ 6 = 5 R3 and 43 ÷ 8 = 5 R3 that they are not
equal.
Answer
33 ÷ 6 = 5.5 is not equal to 43 ÷ 8 = 5.375
Category 4 questions follow
Question
Find the product:
3.2 x 7 =
Answer
22.4
Question
12.2 x 3.6 =
Answer
43.92
Question
If the milk costs $1.70 each, and water costs 1/10 as
much, has much does the water cost?
Answer
$0.17
Question
Tracy the seamstress uses 2 feet of ribbon per day
for two weeks. How many inches does she use in the
two weeks?
Answer
2 ft = 24 in
24 x 14 = 336 inches
Question
If Josh the baker uses 8.3 lbs of flour a day to bake,
how many OUNCES of flour will he use in three
weeks?
Answer
2,788.8 ounces
Category 5 questions follow
Question
46.75 ÷ 5 =
Answer
9.35
Question
If I have 336 cookies and I sell them in packages of
12, how many packages can I sell?
Answer
28 packages
Question
Solve with both a remainder and decimal division
426 ÷ 8 =
Answer
53.25 and 53 R2
Question
If I wanted to buy 17 books that cost $1.45 each and
5 pens that cost $.56 each – write an equation using
parenthesis that will show how much I will spend
Answer
(17 x $1.45) + (5 x $.56)
Question
Make up a story to go with this equation :
(34 x $.78) + (6 x $1.13)
Answer
Teacher to decide!!!