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ما هي أسهل طريقة لحفظ جدول الضرب .... !!؟
الرياضيات 11‏/2‏/2012 تم النشر بواسطة يزودة (yazeedd a).
الإجابات
1 من 7
11‏/2‏/2012 تم النشر بواسطة الثقلين (كتاب الله وعترتي).
2 من 7
التكرار .....

كرر كل جدول الضرب ...... مثال اول يوم احفظ جدول الضرب 1 وكرره

واليوم الثانى احفظ جدول الضرب 2 وكرره

وهكذا
11‏/2‏/2012 تم النشر بواسطة nada love (ندى السيد).
3 من 7
طريقة احمد حلمي

اسهل طريقة لحفظ جدول الضرب مانا حفظته وانا في سنه تانيه من الكتاب زي ما بحفظ اسم الكاتب  ولحد دلوقتي حفظاه
11‏/2‏/2012 تم النشر بواسطة بنوتة شقية (Aya Yoyo).
4 من 7
احفظى بكتابتها وتعمليها كأنهه اغنية يلى قولى معايا 2×2=4
2×3=6
2×4=8 هكذا
ياريت افضل اجابة
وشكرا
11‏/2‏/2012 تم النشر بواسطة محمد إبراهيم 7.
5 من 7
بسيطه بسيطه اكتب علي ورقه كم مره  ردد الارفام
11‏/2‏/2012 تم النشر بواسطة tiger1.
6 من 7
الاعتماد على عملية الجمع في الحساب بحيث نضيف الرقم المعني في كل مرة ثم مع التكرار المستمر تصبح اسهل
11‏/2‏/2012 تم النشر بواسطة youjoums.
7 من 7
Multiply by 10: Just add 0
The easiest number to multiply by is 10. Just “add 0.”
3 x 10 = 30 140 x 10 = 1400
Isn't that easy? This “trick” is really just using our number
system. 3 means “3 ones.” Move 3 once to the left and you get
30, which means, “3 tens.” See how our numbers cycle in tens?
Whenever you move the digits once to the left, that's the same a
multiplying by 10.
And that's the quick way to multiply by 10. Move each digit
once to the left. Fill the last place with a 0.
Easy.

Multiply by 9: It All Adds Up to 9
Have you ever heard of the Amazing Facts of Nine? Let's
take a look.
2 x 9 = 18   1 + 8 = 9
3 x 9 = 27   2 + 7 = 9
4 x 9 = 36   3 + 6 = 9
5 x 9 = 45   4 + 5 = 9
6 x 9 = 54   5 + 4 = 9
7 x 9 = 63   6 + 3 = 9
8 x 9 = 72   7 + 2 = 9
9 x 9 = 81   8 + 1 = 9

See the pattern? When we multiply a single-digit number
times 9:
- The tens digit is one less than our original number.
- The tens digit plus the ones digit equals nine!
This makes it easy to multiply any single digit times 9.
Suppose you want to multiply 5 times 9. First, subtract 1 from
the original number to get the tens digit.
5 - 1 = 4 tens digit of answer
Then subtract this tens digit from 9 to get the ones digit.
9 - 4 = 5 ones digit of answer
So the answer is 45. Let's double check. Do the digits add
up to 9?
4 + 5 = 9
Yes! Isn't this a great trick?
Remember, it only works for single digits. Don't try it on
13 x 9 or 6,425 x 9!

Multiply by 5: It's All 5s and 0s
Is there a trick to multiply by 5? Let's look at a few facts:
2 x 5 = 10   3 x 5 = 15
4 x 5 = 20   5 x 5 = 25
6 x 5 = 30   7 x 5 = 35
See a pattern? If we multiply by an even number, the ones
digit is 0. If the number's odd, the ones digit is 5.
So what's the shortcut? Look at the tens digit. If we multiply
by an even number, the tens digit is half that number. The ones
digit is always 0.
2 x 5 = 10  2 / 2 = 1
4 x 5 = 20  4 / 2 = 2
6 x 5 = 30  6 / 2 = 3
What if we multiply by an odd number? First subtract 1 from
that number. Then take half the answer, and that's the tens digit.
The ones digit is always 5.
3 x 5 = 15 3 – 1 = 2 2 / 2 = 1
5 x 5 = 25 5 – 1 = 4 4 / 2 = 2
7 x 5 = 35 7 – 1 = 6 6 / 2 = 3
So here's the shortcut:
To multiply 5 by an even number: Get the tens digit by
dividing the number by 2. The ones digit is 0.
To multiply 5 by an odd number: Subtract 1 from the
number. Get the tens digit by dividing that answer by 2. The
ones digit is 5.
You can use this to check your work, too. What if you
multiply 5 by 3 and get 20? Since 3 is an odd number, your
answer should end in 5, not 0. You know you made a mistake.

Multiply by 3: It All Adds Up
Remember the Amazing Facts of Nine? When you multiply
by 9, the digits of the answer eventually add up to 9.
8 x 9 = 72 7 + 2 = 9
So how about that number 9? It's 3 times 3, isn't it? Let's
see if 3 has any special properties.
4 x 3 = 12 1 + 2 = 3
5 x 3 = 15 1 + 5 = 6
6 x 3 = 18 1 + 8 = 9
7 x 3 = 21 2 + 1 = 3
Whoa! When you multiply by 3, the digits of the answer
add up to 3, 6, or 9.
You can't really use this to multiply faster. But it is a quick
way to check your work. Say you multiply 11 by 3 and get 34.
Well, 3 + 4 = 7. Oops. You must have made a mistake. The
right answer is 33. And 3 + 3 = 6.
Of course, the trick can only show whether you're wrong. It
can't prove you're right. Let's say you multiply 11 x 3 and get 36.
Well, 3 plus 6 does equal 9, but 36 is still wrong.
Still, this is a neat trick. If you multiply any number by 3, the
digits of the answer add up to 3, 6, or 9. Even big numbers.
524 x 3 = 1572
1 + 5 + 7 + 2 = 15 and 1 + 5 = 6
91,317 x 3 = 273,951
2 + 7 + 3 + 9 + 5 + 1 = 27 and 2 + 7 = 9
You can see that math has patterns. Thanks to patterns
and cycles, the digits of your answer have to add up to three.
Math works from every angle. That's what's so cool about it.

Multiply by 6: we use the method half & whole with even numbers: 2,4,6,8

6 x 2 = 12 ( 1 is half of 2 )
6 x 4 = 24 ( 2 is half of 4 )
6 x 6 = 36 ( 3 is half of 6 )
6 x 8 = 48 ( 4 is half of 8 )
12‏/2‏/2012 تم النشر بواسطة الدين معاملة (الدين معاملة).
قد يهمك أيضًا
ماهي أسهل طريقة لحفظ جداول الضرب
ما طرق حفظ جدول الضرب باليد ؟
جدول الضرب
من هو الذي اكتشف جدول الضرب؟
من هو مكتشف جدول الضرب ؟
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