USING THE STANDARD ALGORITHM

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Presentation transcript:

USING THE STANDARD ALGORITHM MULTIPLYING DECIMALS

YOU CAN DO IT RELAX

FIRST LETS GET A PROBLEM 23.4 X 56 FIRST LETS GET A PROBLEM

PRETEND YOU DON'T HAVE A DECIMAL TO WORRY ABOUT CLEAR YOUR MIND, DUDE PRETEND YOU DON'T HAVE A DECIMAL TO WORRY ABOUT

SO NOW IT'S JUST 234 X 56 Write the problem vertically

THE ONES PLACE Multiply the 6 by the 4 because they are both in the ones place 4 x 6 = 24 Write the 4, carry the 2

TOP 10 NOW MULTIPLY THE 6 BY THE 3, BECAUSE IT'S IN THE TENS PLACE. ADD WHAT YOU CARRY.

HUNDREDS PLACE Now multiply the 6 by 2, because it's in the hundreds place Add what you carried

PUT IT UNDER THE 4 PLACE THE ZERO!!!

THE BOTTOM LINE Multiply the 5 by the 4 because 5 is the other number on the bottom line. And 4 is in the ones place 5 x 4 =20 Write the zero, carry the 2

TENS PLACE REVISITED Now multiply the 5 by the 3 Add what you carried

HUNDREDS PLACE Multiply the 5 by 2 Because the 2 is in the hundreds place

IT ALL ADDS UP So 234 x 56 = 13,104

THIS IS ABOUT MULTIPLYING DECIMALS BUT WAIT!!!!

LET'S LOOK AT THE PROBLEM WITH THE ANSWER AND THE DECIMALS CHILL

EASY BREEZY Here's the rule Since there is one number to the right of the decimal in the problem... There must be one number to the right of the decimal in the answer So, 23.4 x 56 = 1,310.4

“ Let's play with this a little bit.” –MOVING THE DECIMALS AROUND

LET'S TRY 2.34 X 56 This time there are two digits to the right of a decimal, so... There are two digits to the right of the decimal in the answer

OKAY, LET'S TRY .234 X 56 Now there are three digits to the right of a decimal, so... There are three digits to the right of a decimal in the answer

WHAT ABOUT TWO DECIMALS, SMARTY PANTS? BUT HOLD ON!! WHAT ABOUT TWO DECIMALS, SMARTY PANTS?

OKAY, LET'S TRY 23.4 X 5.6 Since there are two digits to the right of a decimal (on top & bottom)... There are two digits to the right of a decimal in your. Answer

AFTER ALL, YOU WON'T BE ABLE TO GET BY ON YOUR LOOKS I HOPE THIS HELPS AFTER ALL, YOU WON'T BE ABLE TO GET BY ON YOUR LOOKS