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  2. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    If the digit 9 is ignored when summing the digits, the effect is to "cast out" one more 9 to give the result 12. More generally, when casting out nines by summing digits, any set of digits which add up to 9, or a multiple of 9, can be ignored. In the number 3264, for example, the digits 3 and 6 sum to 9.

  3. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    In other words, in 2 + 7 = 9, 7 is divisible by 7. So 2 and 9 must have the same remainder when divided by 7. The remainder is 2. Therefore, if a number n is a multiple of 7 (i.e.: the remainder of n/7 is 0), then adding (or subtracting) multiples of 7 cannot change that property.

  4. Trick or Treat Yo'self With These 19 Free Printable ... - AOL

    www.aol.com/trick-treat-yoself-19-free-224832976...

    Trick or Treat Yo'self With These 19 Free Printable Halloween Word Search Puzzles. ... This collection of Halloween word searches is a perfect activity to get you and your family in a witchy mood.

  5. Mnemonic major system - Wikipedia

    en.wikipedia.org/wiki/Mnemonic_major_system

    The system can be employed with phone numbers. One would typically make up multiple words, preferably a sentence, or an ordered sequence of images featuring the owner of the number. The Major System can be combined with a peg system for remembering lists, and is sometimes used also as a method of generating the pegs.

  6. Just Words: Tips and Tricks - AOL

    www.aol.com/news/2014-07-29-just-words-tips-and...

    The battle of wits is on display with Games.com's Just Words. One of Games.com's most popular games, Just Words places you in a wordsmith battle royal against other online opponents or the ...

  7. Inside No 9 tricks BBC viewers with Lee Mack quiz show ... - AOL

    www.aol.com/news/inside-no-9-tricks-bbc...

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  8. Spelling Bee (card trick) - Wikipedia

    en.wikipedia.org/wiki/Spelling_Bee_(card_trick)

    This trick requires some preparation on the part of the magician, who arranges the cards in order before beginning the performance. When spelling from ace to king, the order is 3-8-7-A-Q-6-4-2-J-K-10-9-5. [3] A mnemonic is as follows: [4] 387 years ago, a queen, 64 years old, had 2 sons, Jack and King. Aged 10 and 9, both were in 5th Grade.

  9. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    For example, to say that 14 × 15 was 201 would be unreasonable. Since 15 is a multiple of 5, the product should be as well. Likewise, 14 is a multiple of 2, so the product should be even. Furthermore, any number which is a multiple of both 5 and 2 is necessarily a multiple of 10, and in the decimal system would end with a 0. The correct answer ...