MATH FAST- SECRET TOOLS

USE YOUR HANDS TO  MULTIPLY BY 9     The 9 Times Quickie
  1. Hold your hands in front of you with your fingers spread out.
  2. For 9 X 3 bend your third finger down. (9 X 4 would be the fourth finger etc.)
  3. You have 2 fingers in front of the bent finger and 7 after the bent finger
  4. Thus the answer must be 27
  5. This technique works for the 9 times tables up to 10.

 

  
AA x 11= A (A+A) A 26x11= 2 (2+6) 6=286 1. Use this strategy for two digit numbers only.
2. Multiply 11 by 18. Jot down 1 and 8 with a space between it. 1 --8.
3. Add the 8 and the 1 and put that number in the middle: 198
ABCDx11 A  (A+B)(B+C)(C+D) D 1564x11= 1(1+5) (5+6) (6+4) 4=17204  
ABCDx13 A (3A+B) (3B+C) (3C+D) 3D 2531X13= 2(2x3+5)(5X3+3)(3x3+1)1x3=2(11)(18)(10) 1x3=32903  
         
         
AxA FROM 30-70 OR CLOSE TO 50        
A>50  A-50=DIF (25+DIF)  (DIFxDIF) 52x52= 52-50=2  25+2=27   27(2x2)=2704  
A<50  50-A=DIF (25-DIF)  (DIFxDIF) 48x48= 50-48=2  25-2=23    23(2x2)=2304  
         
         
         
         
         
         
         
         

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