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5.WHY? INVESTIGATE!!!!-- 9 IS INVOLVED SIMPLER PROBLEM NEAR CONSECUTIVE NOS ARE INVOLVED START WITH: 9 X 1 9X12 9 X123 123456789 page2 SUPERFAST ADDITION page3 Maths Magic =ALGEBRA! page4 1. CHOOSE A DIGIT 2.X9 3. X 12345679 BY THIS PRODUCT 4. GET REPEATED DIGITS 1.THINK OF 2 NOS UNDER 20 2.ADD IN COLUMNS 3.NOW ADD BOTTOM 2 4.NOW CONTINUE UNTIL YOU HAVE 10 NUMBERS 5.. NOW ADD ALL THE NUMBERS EXCEL FILE 6.ANS IS 7TH NUMBER X 11  7TH NUMBER X 10 ADD THE NUMBER TO THIS WHY? DOES IT WORK FOR LARGER NUMBERS? EXCEL BEAT SOMEONE USING CALCULATOR page5