1-digit by 4-digit Multiplication

1-digit x 4-digit Multiplication

• THINK! Can we apply the same methods we used when we multiplied a 1-digit by 2-digit and 1-digit by 3-digit number to a 1 digit by 4-digit multiplication problem??

1-digit x 4-digit Multiplication

• Remember: For every PLACE VALUE added in the number you ADD an area or a rectangle

6 X 23

7 X 233

8 X 6, 345What

patterns do you notice?

2-digit by 2-digit Multiplication

2 x 2-Digit Multiplication

2-digit by 2-digit Multiplication

43 x 27 = ?• Expand the numbers by place values• Draw a rectangle and label the dimensions• Find the “area” of each rectangle by multiplying the dimensions• Then add the partial products

20 7

40

3

40 x 20 = 800

3 x 20 = 60

40 x 7 = 280

3 x 7 = 21

800280

6021+

1,161

?

Your Turn!

• Practice this problem on your own…

45 X 62