fun x thinking = fabulous. * 3 sets of 4 coins. how many coins in all? * 3 rows of 8 stamps. how...
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Fun x Thinking = Fabulous
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*3 sets of 4 coins. How many coins in all?
*3 rows of 8 stamps. How many stamps?
*3 bags of 12 oranges. How many oranges?
*5 classes of 25 students. How many students?
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*3 sets of 4 coins. How many coins in all?
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3 rows of 8 stamps
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*To find the total of these objects we multiplied the number of objects on the side by the number of objects on the top.
*In other words, we multiplied the rows by the columns.
* 3 x 4 = 12 and 3 x 8 = 24
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*Take a piece of plain paper.
*Fold it into thirds.
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*Take a piece of plain paper.
*Fold it into thirds.
*Shade in 2 of those
third pieces.
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*Take a piece of plain paper.
*Fold it into thirds.
*Shade in 2 of those
third pieces.
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*Now turn your paper sideways.
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*Now turn your paper sideways.
*Fold it into thirds on
this side.
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*Now turn your paper sideways.
*Shade one third
of this side.
*If we were to write
a fraction for the
region shaded with both
colors, what denominator would you choose?
What would be your numerator?
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*Now turn your paper sideways.
*Why did our
denominator change
from 3 to 9?
*Why was it
important for us to
turn the paper when we folded it a second time?
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*When we are multiplying fractions, we are looking for a fraction of a fraction or a fraction of a piece out of a whole.
*2/3 is part of the whole rectangle.
*When we say
1/3 of 2/3, we are
finding the value of
a 1/3 piece of that
2/3 part.
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*Open your math journal to page 269.
*Complete page 269 with a partner that does not sit at your table.
*When you both are finished, show your work to a teacher.
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*How would you multiply a fraction by a whole number?
¾ of 6
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*Each of the wholes must be divided into fourths.
¾ of 6
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*You only want 3 of the 4 pieces in each whole.
¾ of 6
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*Reassemble the pieces to find out how many wholes and pieces are left.
¾ of 6
=4 ½
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*If we use computation to find the solution we need to rewrite 6 in fractional form.
¾ * 6¾ * 6/1
*6/1 is an improper fraction. When it is simplified 6/1 = 6. Because it is equivalent in value, you can use 6/1 to multiply.
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¾ of 6 = ¾ * 6/1
3 * 6
4 1
Cross simplify the numbers.
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¾ of 6 =
3 * 6
4 1
We need to multiply the denominator by 4 because we cut the whole into 4 pieces.
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¾ of 6 =
3 * 6
4 1
We need to multiply the numerator by 3 because we need 3 pieces from each whole.
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¾ of 6 = ¾ * 6/1
3 * 64 1
We can cross simplify the numbers because both numbers are divisible by 2.
÷2 = 3
2=÷2
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¾ of 6 = ¾ * 6/1
3 * 3
2 1
Cross simplify the numbers.
= 9 2
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¾ of 6 = ¾ * 6/1
Simplify the answer.9 =
41/22
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*You will complete Math Journal 2 page 274 with a partner.
*When you are both finished, show your work to a teacher.