Multiplying 2-digit by 1-digit numbers

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Presentation transcript:

Multiplying 2-digit by 1-digit numbers Lesson 5.6 - Review Multiplying 2-digit by 1-digit numbers

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

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

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

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?

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

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

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?

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?

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?

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?

Homework Copy the problems in your notebook and solve: 1. 34 x 2 = 7. 95 x 6 = 2. 45 x 8 = 8. 16 x 5 = 3. 19 x 9 = 9. 31 x 7 = 4. 64 x 7 = 10. 52 x 8 = 5. 92 x 3 = 11. 65 x 0 = 6. 89 x 4 = 12. 19 x 7 =

Extra Practice

Extra Practice