how can i find the unknown number in a number sentence? may 2, 2013
TRANSCRIPT
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How can I find the unknown number in a
number sentence?
May 2, 2013
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Pop Quiz1. What is the unknown number in the following number sentences? n + 12 = 16 45 - _____ = 34 x 9 = 72 108 ÷ 9 =
2. What do we call the symbols that represent the unknown number?
n = 4
11
8 12
Variables
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VariablesAre symbols that represent unknowns in a
number sentence. They can be shapes, pictures, letters and fill-in-the-blanks.
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The case of the missing number.
Use your resources to
help you solve each case.
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Case 1Gift Bags
Sara and James are making gift bags for their party guest. If they have 36 party favors, how many gift bags can they fill if they are putting 3 favors in each bag?
Clues
• 36 party favors
• 3 favors per bag
• How many bags can they fill
36 ÷ 3 =
or
X 3= 36
12
12
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Case 2 Dog Days
Clues
Spot spots a squirrel and decides to chase after it. If he chases 5 squirrels per hour how many will he chase in 6 hours?
• 5 squirrels per hour
• How many will he chase
in 6 hours?
5 x 6 =Or
÷ 5 =
6
30
30
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Case 3Monkey Business
Margo Monkey has a bunch of 35 bananas to share with her friends. If there are six friends plus herself how many bananas will everyone get?
You’re on
your own
now super
math
sleuths.
Remember
to write
down your
clues and
the problem
you need to
solve.
Can you close this case?
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Case 3Monkey Business
Margo Monkey has a bunch of 35 bananas to share with her friends. If there are six friends plus herself how many bananas will everyone get?
Can you close this case?
Clues
• 35 bananas to
share• 6 friends plus
self…hmmm 6+1
=7• How many
will everyone
get?
35 ÷ 7 =
5 =
YOU DID IT!