Adding Three Digit Numbers
Date: Wed, 02 Nov 94 06:59:29 EST From: ainsley wagoner Subject: math question Dr. Math, My name is Ainsley Wagoner and I am a 1st grader in kentucky. I'm writing you on my daddy's computer. My question is this. 200+1000=?. Adding things with seven is hard for me, like 8+7=?, 7+9=?. Thanks Dr Math. I really like my Dad's computer and math and reading. Good-bye Ainsley Wagoner
Date: Wed, 2 Nov 1994 09:11:54 +0900 Subject: Re: math question Hi Ainsley, Thanks for writing to us. My name is Margaret. I am one of the doctors Math. Thanks for writing to us. 200+1000 = ? Sometimes it is easier to write problems like this in the other way. For example: 200 In this way, you begin from the right (the 0's) and add each +1000 column. So, 0+0=0, 0+0=0, 2+0=2, and then pretend there ------ is one more 0: 0+1=1. 1200 Try some more. Like 300+400=? 222+1000=? 400+ 200=? Now, for problems with seven. I am not sure exactly what to suggest. Sometimes when I add numbers, I try to split up the number to make it easier. You know that 7=5+2, right? Well, if it is easier for you to add things with five and things with two. You could do this instead. So, instead of 8+7, try 8+5+2. and for 7+9, try 5+2+9. I hope this helps. Please write back if you don't understand, or if you have any other questions. Tell your friends about us too. Margaret- Doctor on call
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.