• Lesson #4 – Adding Whole Numbers

    1.  Reasonable - something that makes sense when given facts are taken into account. 

    2. Regroup - to compose or decompose ones, tens, hundreds, thousands, and so forth.   For example, 10 ones can be regrouped as 1 ten, or 1 hundred can be regrouped as 10 tens.

    3.  Addend - a number being added

    4.  Algorithm - a set of routine steps used to solve problems

    5.  Estimate (verb) - to give an approximate number or answer based on mathematical thinking.

    6.  Round - to approximate the value of a number by finding the nearest ten, hundred, or other place value.

    7.  Sum - the result of addition.

    Addition Strategies

    Addition Standard Algorithm                                             Addition Place Value