Multiplying 2digit by 1digit numbers with base10 blocks Carbs Teachers have different nicknames for base10blocks This presentation uses waffles fries and tater tots Waffles100 Fries10 Tater tots1 ID: 514713
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Slide1
Base-10 Multiplication
Multiplying 2-digit by 1-digit numbers with base-10 blocksSlide2
Carbs!
Teachers have different nicknames for base-10blocks
This presentation uses waffles, fries and tater tots
Waffles=100; Fries=10; Tater tots=1Slide3
Ready, Set, Go!!
Let's Begin with 23x3Slide4
Representing
First, let's represent 23 with our base-10 notation
That's two tens and 3 ones
Or 2 fries and 3 totsSlide5
Here we go...
Multiplying 23 x 3
Draw 3 sets each with 2 fries and 3 totsSlide6
French Fries
There are 2, 4, 6 fries
That's 6 tens or ...
60Slide7
Tater Tots
There are 3, 6, 9 tater tots
That's 9 ones or...
9Slide8
Add it up
So we have 6 tens and 9 ones
AKA
60 + 9
AKA 69
So 23 x 3 = 69Slide9
But wait!!
What if you have to regroup?Slide10
Chill...
Let's try 125 x 5Slide11
Carbo-loading
That's one waffle,
Two fries,
& 5 tater tots Written 5 timesSlide12
Waffles
So that's 5 waffles...
Or 5 hundreds
Or 500Slide13
Fries
That's 10 fries
Or 10 tens
Or 100
So ten fries makes another waffleSlide14
Tater Tots
That's 25 ones
Or 25
So 25 tater tots can be traded for 2 fries and 5 totsSlide15
Wrap it up...
So 125 x 5 = 625
This is what it might look like on a sheet notebook paper-->Slide16
I hope this helps...
Here's a picture of your mother driving home