School RULES! Math. Emma MacLaren Henke
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Название: School RULES! Math
Автор: Emma MacLaren Henke
Издательство: Ingram
Жанр: Учебная литература
Серия: American Girl
isbn: 9781609587635
isbn:
card shows a product (the answer to a multiplication problem). The other two points show factors—the numbers you multiply together to get the product.
product
factor
factor
Practice multiplication facts by
covering the product.
4 × 6 = 24 6 × 4 = 24
Practice division facts by covering
one of the factors. Cover the other
factor, too, so you can memorize
both division facts on the card.
24 ÷ 6 = 4 24 ÷ 4 = 6
In math, paying attention to patterns pays off. Triangle flash cards help you learn
addends and sums, and factors and products, as groups of numbers that go
together. Thinking about math facts in these groups will take you farther than
just memorizing math answers. When you make sense of numbers this way,
it can make learning math so much easier!
Clever Calculator
Use your calculator to perform math magic!
Favorite Number
1. Tell a friend to name her favorite number from 1 to 9.
2. Give your friend your calculator, and instruct her to multiply the number
she picked by 9.
3. Then tell her to multiply the result by 12,345,679 (the numbers 1 through 9
in order, without the 8).
4. Ask her to show you the calculator.
You both will see a 9-digit number in which every digit is
the number your friend selected. If she chose 3, for example,
the calculator will show 333333333.
Mind Reader
1. To prepare for this trick,
write the number 73 on a slip of
paper and put the paper in your pocket.
2. Then ask a friend to choose any 4-digit number and remember it.
3. Tell her to type her number into your calculator
twice in a row. (For example, if she chose 3,356,
she enters 33563356.)
4. Then tell your friend to divide the number
she entered by 137.
5. Finally, tell her to divide the number she has
now by her original 4-digit number.
6. Take the paper from your pocket, unfold it,
and ask, “Is this the number you see on
the calculator?”
The calculator
will read 73,
just like your
paper!
The Story of Math
Math teachers always say, “Show your work!”
Here’s what makes it so important.
You have a story in mind. It’s a wonderful, funny, interesting story. And you decide
to tell it. So you write,
She lived happily ever after. The end.
That’s not much of a story, is it?
Math problems are like stories. The work you use to figure out the answer to a
problem is as important as all the twists and turns of a good tale. When you do
math, you want to get the correct solution, but it’s usually more important to be
able to explain how you got it. You have to tell the whole story!
Elsa and Sabrina ride the school bus. Elsa lives 3 miles from
school, and Sabrina lives 5 miles from school. If the bus takes each
girl directly from home to school and back again, how many
more miles does Sabrina ride the bus each day than Elsa?
This particular problem is not that complex. Perhaps you see quickly that the
solution is 4 miles. But “4 miles” is not the complete story, is it?
Elsa and Sabrina ride the school bus. Elsa lives 3 miles
from school, and Sabrina lives 5 miles from school. If the bus
takes each girl directly from home to school and back
again, how many more miles does Sabrina ride the
bus each day than Elsa?
THAT’S the whole story!
Drawing pictures helps you figure out problems that don’t seem simple. In the
story of Elsa and Sabrina and the school bus, when you draw how far each girl
travels each day, it’s easy to see the difference.
Get in the habit of always showing your work, even when a problem seems easy.
That way, when problems get harder, you’ll be used to showing your work and
drawing pictures to solve them. This will make math much easier as you get older!
Sabrina
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