My son is in 4th grade and working on double and triple digit multiplication. We use Math U See for our math curriculum. This idea comes from his video however we came across this a few years back from another source when my daughter was learning multiplication. We have found that using a sheet of lined notebook paper and turning it sideways makes beautiful columns for keeping units, tens, hundreds, etc. organized. We do have to rewrite the problems but place value is kept clear and he is able to get the right answers which of course adds to his overall math success.
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