Whole Number Operations

Addition Rules

- Line up numbers by place value - Number with most digits should be on top- Order doesn't matter- Can add more than one number at one time.- Regroup as necessary

Example

Subtraction Rules

- Put first number on top - Line up numbers by place value- Can NOT subtract more than one number at a time- Regroup as necessary

Example

45 + 193

193 Addends +45 238 Sum

305 - 79

305 -79 226 difference

Multiplication Rules

- # with most digits on top - Line up by place value- Can use * or ( ) but not x (reserved for variables)

Example 742 * 1,394 or 742(1,394)

1,394x 742 factors _ _0 __00 product

Division Rules

- First number "gets in the house" first, so the second number is left "outside the door"- Divide thinking, "How many times does ____ go into ____?"- If you say "none", put a zero in the quotient and continue- Make sure you line up your numbers carefully!

Example

Summary: What did you learn about whole number operations?

53,802 / 9 Quotient 05,978 Divisor 9 53,802 Dividend -45 88 -81 70 -63 72 -72 0