Base-10 Multiplication

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# Base-10 Multiplication - PowerPoint PPT Presentation

## Base-10 Multiplication

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##### Presentation Transcript

1. Base-10 Multiplication • Multiplying 2-digit by 1-digit numbers with base-10 blocks

2. Carbs! • Teachers have different nicknames for base-10blocks • This presentation uses waffles, fries and tater tots • Waffles=100; Fries=10; Tater tots=1

3. Ready, Set, Go!! • Let's Begin with 23x3

4. Representing • First, let's represent 23 with our base-10 notation • That's two tens and 3 ones • Or 2 fries and 3 tots

5. Here we go... • Multiplying 23 x 3 • Draw 3 sets each with 2 fries and 3 tots

6. French Fries • There are 2, 4, 6 fries • That's 6 tens or ... • 60

7. Tater Tots • There are 3, 6, 9 tater tots • That's 9 ones or... • 9

8. Add it up • So we have 6 tens and 9 ones • AKA • 60 + 9 • AKA 69 • So 23 x 3 = 69

9. But wait!! • What if you have to regroup?

10. Chill... • Let's try 125 x 5

11. Carbo-loading • That's one waffle, • Two fries, • & 5 tater tots • Written 5 times

12. Waffles • So that's 5 waffles... • Or 5 hundreds • Or 500

13. Fries • That's 10 fries • Or 10 tens • Or 100 • So ten fries makes another waffle

14. Tater Tots • That's 25 ones • Or 25 • So 25 tater tots can be traded for 2 fries and 5 tots

15. Wrap it up... • So 125 x 5 = 625 • This is what it might look like on a sheet notebook paper-->

16. I hope this helps... • Here's a picture of your mother driving home