Teacher2Teacher 
Q&A #129 
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From: David <powerofall@wmconnect.com> To: Teacher2Teacher Public Discussion Date: 2005031223:44:12 Subject: Multiplying using a Ruler or Clock 1 2 3 4 5 6 7 8 9 10 11 12 When multiplying by 2's Ex: 2*2 Add up the number on both sides of the 2 to get your answer (1+3)=4 When multiplying by 3's Ex: 3*2 Add up all the numbers (1+2+3)=6 When multiplying by 4's and above subtract 2 from the multiplyer (42) is 2. The middle number is repeated this many times (2) and the numbers to the side are added to it to get your answer Example 12*2=24 Subtract 2 from 12 to get 10 (repeat the middle number 10 times 1+(2*10=20)+3=24 My daughter is in the 1st grade and can do her multiplication using a 12 inch ruler or a standard analog wall clock My question is that I cannot find any teachers that know anything about multiplying this way. I came up with this on my own because I wanted to help make math easy for my daughter. You would be suprised to find out how quickly your 6 year old can learn to multiply and have fun doing it using a wall clock or ruler. Thanks
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