2. Objectives: Students will be able to: Multiply Multi-digit numbers using the standard algorithm Divide Multi-digit numbers using the standard algorithm Multiply and Divide by Powers of 10

6. ANSWERS

8. Dividing Difficult Large Numbers 31) 1719 31 will not go into 1 31 will not go into 17 31 will go into 171

9. Dividing Difficult Large Numbers 31) 1719 To figure what your first number will be cover the 1 in 31 & the 1 in 171.

10. Dividing Difficult Large Numbers 31) 1719 Now ask how many 3’s will go into 17.

11. Dividing Difficult Large Numbers 31) 1719 Be sure to put that number directly above the 1 not the 7. 5

12. Dividing Difficult Large Numbers 31) 1719 Now multiply the 5 x 31 and place it under the 171. 5

13. Dividing Difficult Large Numbers 31) 1719 31 x5 5 155 169

14. Dividing Difficult Large Numbers 31) 1719 5 155 169 Now cover up the 1 in 31 & the 9 in 169

15. Dividing Difficult Large Numbers 31) 1719 5 155 169 Ask how many 3’s will go into 16.

16. Dividing Difficult Large Numbers 31) 1719 5 155 169 Place that number next to the 5 in your quotient. 5

17. Dividing Difficult Large Numbers 31) 1719 5 155 169 Now multiply 31 x 5. 5

18. Dividing Difficult Large Numbers 31) 1719 5 155 169 5 155 14 Subtract & your answer is 55 R14

19. Check It Using the Inverse of Division: 31 Multiply the divisor by the quotient. X 55 155 +1550 1705 + 14 Add Remainder to the product 1719 Your answer should match the original dividend

20. Multiplying and Dividing by powers of ten MEAP REVIEW

21. 574823 What are the PLACE VALUES of the digits in this number?

22. 574823 So that means 500 + 30 + 7 + + +

23. 574823 The decimal point just separates the whole numbers from the decimal fractions

24. 574823 What happens when I multiply this number by 10 ?

25. 574823 Each digits value will become 10 times bigger so the digits move LEFT into the next column

26. 537.482 x 10 = 5374.82 Multiplying by 10 It LOOKS like the decimal point moves one place to the right. (and that is how many teachers ask you to think of it)

27. Multiplying by 10 Moving the digits one place to the LEFT looks the same as moving the decimal point one place to the RIGHT. 574823 574823

28. More Multiplying and Dividing Digits Move( LOOKS LIKE ) Decimal Point Moves x10One place to LEFTOne place to RIGHT x100Two places to LEFTTwo places to RIGHT ÷ 10One place to RIGHTOne place to LEFT ÷ 100Two places to RIGHTTwo places to LEFT

29. Thanks for watching. I hope I haven’t LEFT you confused but I thought we should get this RIGHT To practice multiplying and dividing by multiples of ten, click on this website: http://www.quia.com/mc/656 37.html

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31. Then…. You’ll need all your mental maths skills to escape with the bio-rods in this exciting Mission 2110 game. Alien Game Homework TIME Multiplication and Division Practice Handout