• Adding & Subtracting Whole Numbers


    4.NBT.4 Fluently add and subtract multi-digit whole numbers using the standard algorithm.

    4.OA.3  Solve multi step word problems posed with whole number and having whole number answers using the four operations...Represent these problems using equations with a letter standing for the unknown quantity.  Assess the reasonableness of answers using mental computation and estimation strategies including rounding. 


    Unit Information:

    Vocabulary Words:

    Addition - sum of two addends

    Subtraction - operation on two numbers that tells the difference

    Sum - answer to an addition problem

    Difference - answer to a subtraction problem

    Addend - numbers being added together

    Subtrahend - the amount being subtracted

    Minuend - the first number in a subtraction sentence (the whole)  
    Commutative Property of Addition – the order in which numbers are added does not change the sum. Example: 6+4+3=13, 4+3+6=13
    Associative Property of Addition – the way in which numbers are grouped when added does not change the sum. Example: (6+3)+2=11, 6+(3+2)=11
    Identity Property of Addition – the sum of any number and 0 is the number. Example: 5+0=5, 11+0=11
    Inverse Operation - the opposite of something. Example addition is the inverse operation of subtraction

    I have listed several websites below that will be helpful to you during this unit. Some of the websites have online games, others have worksheets that may help you practice with these skills. Feel free to use as much or as little as you'd like.