1. Multiplying 2-digit by 1-digit numbers
Lesson Review
Multiplying 2-digit by 1-digit numbers

2. Review
9 x 60 =
6 x 300 =
7 x 70 =
40 x 8 =

3. Review – Break Apart! 43 x 5 = (_____ x 5) + (_______ x 5)
Grid method:
38 x 4 =
63 x 7 =

4. Set the purpose
You have learned how to use the “breaking apart” method. Today you will learn another way to do multiplication.

5. Pose the Problem
A school ordered 9 boxes of books. There are 15 books in each box. How can you use paper and pencil to find how many books there are altogether?

6. Together
Multiply.
32 x 4 =
57 x 8 =
19 x 6 =

7. On your own
Multiply.
17 x 8 =
34 x 6 =
71 x 7 =

8. Word Problems How many blue t-shirts are in 3 boxes?
Number of T-shirts per box
Color of T-shirt 35
Red 28
Blue 52
Orange 65
Green
How many blue t-shirts are in 3 boxes?
How many orange t-shirts are in 6 boxes?

9. Word Problems How many red t-shirts are in 5 boxes?
Number of T-shirts per box
Color of T-shirt 35
Red 28
Blue 52
Orange 65
Green
How many red t-shirts are in 5 boxes?
How many green t-shirts are in 5 boxes?
How many more red t-shirts are there than green t-shirts in 5 boxes?

10. Word Problems
Average rate of growth per month
6 mm
Fingernails
13 mm
Hair
What is the average length fingernails will grow in one year?

11. Word Problems Average rate of growth per month
6 mm
Fingernails
13 mm
Hair
How much longer will hair grow than fingernails in one year?

12. Homework Copy the problems in your notebook and solve:
1. 34 x 2 = x 6 =
2. 45 x 8 = x 5 =
3. 19 x 9 = x 7 =
4. 64 x 7 = x 8 =
5. 92 x 3 = x 0 =
6. 89 x 4 = x 7 =

13. Extra Practice

14. Extra Practice