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Q&A #4824


A different way to subtract than normally taught

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From: Jeanne (for Teacher2Teacher Service)
Date: Oct 06, 2000 at 19:38:31
Subject: Re: A different way to subtract than normally taught

Hello Val, I have not heard of "nick's method," but there are different ways of regrouping than the way you described (which is the way I was taught also). The method we were taught is like the following: 34 ---> 20 + 14 This is where we "borrowed from the tens place." -18 ---> -10 - 8 Subtract 8 from 14 to get the ones place. When --- -------- we did 2-1 we were actually doing 20-10 to get 10 + 6 ---> 16 tens place. Here are two possible ways your daughter's class could be looking at subtraction: One method: 34 ---> 20 + 14 Break the 34 down into 20+14 since 18 is -18 ---> -18 easy to subtract from 20. Remember the 14 to add --- -------- later. 2 + 14 ----> 16 Another method: 34 ---> 34 Break down the 18 into 14 + 4 and subtract first the -18 ---> -14 - 4 14 and then the 4. --- --------- 20 - 4 ---->16 And there are other ways. I can remember subtracting from left to right before I was taught to subtract from right to left. 34 ---> 24 From here I did a compensation method similar to -18 - 8 the first method I shared with you to get the an --- --- answer of 16. Hope this helps. -Jeanne, for the Teacher2Teacher service

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