Addition+&+Sub+Strategies

Number Bonding.

Number Bonding Addition

Addition- The equations are usually written horizontally to encourage the development of number sense. Students move to a vertical form as they approach learning vertical addition and the traditional algorithm.







Subtraction Strategies

**Subtraction Number Bonding** – emphasizes part-whole thinking. Helps student connect addition and subtraction. Always start by using concrete materials when starting out. Select a number less than 20 and record it. Think of different ways to break the number into two parts. Then find more ways to break up the number into two parts. Write down the number bonds and notice patterns.



**Place Value Subtractions with Mats & Place Value Disks** – focuses on the action needed to solve subtraction problems. This will involve trading a tens disk for 10 ones. The manipulation of disks will help promote the understanding of subtraction.

**Subtraction with Branching, without regrouping, then with regrouping**- uses number decomposing to simplify a problem. There is more than one correct way to solve a problem.