Math grade 8 review of Computational Skills

Adding and subtracting Whole numbers

Multiplication and division

Strategies that work

Rules for multiplication0 rule – answer is zero1 rule – answer is the other number2 rule-- doubles4rule- Timmy’s special (double double)5 rule – odds and evens6 rule – triple play9 rule – power fingers

2 and 3 digit multiplication

0Why the “O”?...........

Prove the answer....

45240

Division.......Steps of division-

DMSCB

• Does – How many times does this number DIVIDE into that number

• McDonalds – MULTIPLY that number by the divisor.

• Sell – SUBTRACT the answer from the number in the divisor.

• Cheese- CHECK to see if it is correct.

• Burgers – BRING DOWN another number.

Prove this......