1.02e
- 2. 1. Sarah has four times as many hair clips as Lindsay. Lindsay as h hair clips. How many hair clips does Sarah have? A. 4 x h B. 4 + h C. h ÷ 4 D. h - 4
- 3. 2. Joey has twelve more DVDs than Dakota, who has d DVDs. Which expression represents this situation? A. 12 + d B. 12 ÷ d C. d - 12 D. 12 x d
- 4. 3. The book that Ms. Green is reading has 8 times fewer pages than the book that her friend is reading. If her friend’s book has p pages, how many pages does Ms. Green’s book have? A. p + 8 B. p - 8 C. 8 x p D. p ÷ 8
- 5. Relating Multiplication with Division
- 6. Let’s Remember: We know our fact families: 5 x 7 = 35 35 = 5 x 7 7 x 5 = 35 35 = 7 x 5 35 ÷ 7 = 5 5 = 35 ÷ 7 35 ÷ 5 = 7 7 = 35 ÷ 5 We also can reverse a multiplication or division number sentence. For example:
- 7. We can reverse a multiplication sentence to make a division number sentence. For example: 9 x 11 = 99 99 ÷ 11 = 9
- 8. Let’s See that Again 45 ÷ 9 = ____
- 9. Now, was that so hard?
- 10. You Try Write a Related Multiplication or Division Sentence: 9 x 12 = 108 95 x 4 = 380 450 ÷ 10 = ____ 132 ÷ 11 = ___
- 11. Jacob solved the following multiplication equation: 23 x 8 = 184 What number sentence could he use to check his answer? D 100
- 12. 23 x 8 = 184 184 ÷ 8 = 23 or 184 ÷ 23 = 8 D 100
- 13. Problem Solving – A division problem that you can solve with multiplication Last year there were a total of 78 students in the 4th grade classes of Encarnacion, Boynton and Hamme. If each class has the same number of students, how many students were in each class?
- 14. Think – “Zzzz” There are a total of 78 students in the 4th grade classes of Encarnacion, Boynton and Hamme. If each class has the same number of students, how many students are in each class ? Division – I know the total 78 ÷ 3 = ? ? x 3 = 78
- 15. Tutters says, “Meowwww… it’s your turn!”
- 16. D 200 Gabrielle solved the following math problem: 32 x 4 = 128 What number sentence could she use to check her answer?
- 17. 128 ÷ 4 = 32 32 x 4 = 128 D 200
- 18. Now – don’t let the variables in the next problems scare you!
- 19. D 400 If 48 ÷ n = 6 What does 6 x n = ?
- 20. 48 because n = 8 48 ÷ 8 = 6 6 x 8 = 48 D 400
- 21. True or False The following statement is correct: If n x 3 = 18, then n = 18 ÷ 3 D 300
- 22. True because… If n x 3 = 18, then n = 18 ÷ 3 n = 6 6 x 3 = 18 6 = 18 ÷ 3 D 300 ZZZZ N x 3 = 18
- 23. True or False The following statement is correct: If 5 x f = 35, then 35 = 5 ÷ f D 300
- 24. False because… If 5 x f = 35, then f = 7 And 35 = 5 ÷ 7? NO WAY! D 300 ZZZZZZ 5 x f = 35
- 25. Focused and alert, no sleeping now!
- 26. So… if all I have to do is reverse the number sentence? What is another way to write the equation 308 ÷ n = 14 ? a. 14 + n = 308 b. 14 x 308 = n c. 14 x n = 308 d. 308 – 14 = n (Let’s just reverse the number sentence in the question. 14 x n = 308, so c is our answer!)
- 27. Well, how about with variable N What is another way to write the equation N x 24 = 120? a. N = 24 ÷ 120 b. N = 120 ÷ 24 c. N = 24 x 120 d. N x 120 = 24 (Let’s just reverse the number sentence in the question. 120 ÷ 24 = N, so b is our answer!)
- 28. What is another way to write the equation 54 ÷ n = 6? a. n = 9 x 6 b. n = 54 x 6 c. n = 54 ÷ 6 d. n = 54 x 9 (THINK – What number could n be? Which answer choice makes sense for that number?)
- 29. Write a related equation for the following number sentences: 36 ÷ 6 = 6 25 ÷ 5 = 5 72 = 9x 8 6 x 7 = 42 y ÷ 4 = 5 3 x b = 6 c = 8 x 2 d ÷ 10 = 9 Find the value of the variable (letters) in the last four equations.
- 30. Which statement is correct? A. If a ÷ 3 = 7, then a = 7 x 4 B. If 5 x 6 = b , then 6 x b = 5 C. If 14 ÷ y = 2, then y = 14 x 2 D. If d = 24 ÷ 6, then d x 6 = 24 D 500