1. Two-digit by one-digit multiplication
October 11, 2013

2. We have learned how to multiply…
Using base ten pieces
Ex/ 24 x 3
Using rectangles
Ex/ 24 x 3 4
6 tens & 9 ones
= 69
20 x 3 = 60
4 x 3 = 12 3 60
+ 12 72

3. THINK! Is there a way to use place value without having to draw the rectangle?
24 x 3
24 has 2 tens (20) + 4 ones
If I multiply by PLACE VALUE:
20 x 3 = 60
4 x 3 = 12 72 4
20 x 3 = 60
4 x 3 = 12 3 +

4. Let’s Make a Connection…
When we multiply by PLACE VALUE, which form are we writing the numbers in?
34 x 6
34 =
We are writing the number 34 in expanded form
6 = 6
Can we e-x-p-a-n-d the number 6 anymore? Why?

5. You’re Turn…
Solve the following problem using the All Partials Method:
42 x 7
40 X 7 = 280 +
2 X 7 =
294

6. More Practice!
45 x 8
34 x 9
23 x 7