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Easier way on how to remember timestable

 
 
mlyah
 
Reply Sun 27 May, 2007 08:41 pm
My nephew cant memorize timetable 9, is there any easiest way....
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Type: Discussion • Score: 1 • Views: 516 • Replies: 6
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Craven de Kere
 
  1  
Reply Sun 27 May, 2007 08:44 pm
Subtract one from the number being multiplied by nine, take the result and it's the first number of the answer. Then subtract 9 by this number and the result is the second number.

e.g.

9x9

9-1 = 8
9-8 = 1

Answer: 81

9x5

5-1 = 4
9-4 = 5

Answer: 45
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Eorl
 
  1  
Reply Sun 27 May, 2007 09:16 pm
Another way is by jumping up to 10x then subtracting the extra

9 x A = (10 x A) - A

eg

9 x 9 can be deduced by knowing that 10 x 9 = 90...then subtract that extra 9 ....81.

This one is handy for larger numbers, such as 9 x 47....10 x 47 = 470.....470-47=423

Having said that....his entire life will be easier if he gets off his lazy butt and memorizes his tables properly now. A good way to do that is for the whole family to chant the 9x table in the car.... all the way to... wherever!
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dadpad
 
  1  
Reply Mon 28 May, 2007 03:01 am
There is no substitute for repetition. Over and over again. flash card. Half cards. Write the sum on a card and the answer on a different card cut the answer card in half horizontally have your nephew guess what the answer might be using the half answer card as a clue.

9
18
27
36
45
54
63
72
81
90
99
108

look at the pattern of the last number, look at the pattern of the first number
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jespah
 
  1  
Reply Mon 28 May, 2007 08:17 am
Up to ten (9 x 10), if you add the 2 numbers together, you get 9.

09
18
27
36
45
54
63
72
81
90
0 Replies
 
littlek
 
  1  
Reply Mon 28 May, 2007 08:23 am
Jespah's method was the way I memorized them, more or less. If you multiply 9 times 7, your answer will start with one less than 7 (6) and the two digits will equal 9 when added together (6+_?_=9, ?=3).

Of course, he can multiply by 10 (10x7=70) and take one 7 away (70-7=63).
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mlyah
 
  1  
Reply Fri 8 Jun, 2007 07:20 pm
Thats cool
Very Happy Thanks guys!
0 Replies
 
 

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