Chart can be used to put plastic dots, bead, beans or unit cubes on and then manipulated for adding and subtracting activities. I have also used them with a dry erase marker by putting them in a plastic sleeve or laminating them.
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Add up to four two-digit numbers using strategies based on place value and properties of operations.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
100 can be thought of as a bundle of ten tens - called a “hundred.”
10 can be thought of as a bundle of ten ones - called a “ten.”
Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases: