Subtract 1-, 2-, or 3-digit numbers from 3- and 4-digit number with/without renaming
They're also available for nearly all grade levels. There are printable middle school, high school, elementary school, and even pre-school worksheets.
How much money do I have left if I buy a soda? By the end of the week, how much of my daily allowance will I be able to save if I don't?
Another important point I keep in mind is that I never want this regular math review time to take up and hour of class time. I want it to be quick but effective. This is not instructional time, but time for the students to review material they have already learned.
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