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3 Cards in this Set
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multiply 11 times any two digit number. For example,
39 * 11 
429
step 1, 3 + 9 = 12 step 2, put between 3 and 9 (309) step 3, add them all 309 + 12 = 429 

Divide any number by 5
65 / 5 101 / 5 
multiply by 2 and move the decimal place over by 1.
E.g.65 * 2 = 130 , then remove one 10s spot. answer 13 E.g. 101 * 2 = 202, the remove one 10s spot. answer 20.2 

Multiply any number by 4
e.g. 72 x 4 e.g. 13 x 4 
Double twice.
72 + 72 = 144 144 + 144 = 288 13 + 13 = 26 26 + 26 = 52 